Doctor Tim - The Mystery of the Poisoner at Large

Summary

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Harold's Old Time Radio

Episode: Doctor Tim - The Mystery of the Poisoner at Large

Date: May 9, 2026

Host: Harold's Old Time Radio

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Episode Overview

This episode features an exciting adventure from Doctor Tim Detective, a series from the Golden Age of Radio. In "The Mystery of the Poisoner at Large," Dr. Tim—serving as both physician and detective—is called upon to unravel a large-scale poisoning event in his hometown. With the help of his young assistants, Sandy and Jill, and collaboration with Dr. Jarvis from the health department, the team must track down the source of a sudden outbreak of food poisoning before more people fall ill.

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Key Discussion Points and Plot

The Mystery Begins: Unusual Poisoning Outbreak

• Dr. Tim introduces the central case: a wholesale food poisoning outbreak—rare, alarming, and urgent to resolve.
  • Dr. Tim Detective: "It isn't very often these days that you run across a case of wholesale poisoning. But when you do, well, there's never a dull moment until you've tracked the whole thing down." (00:31)

Science in Action: The Centrifuge Demonstration

• Dr. Tim explains his laboratory methods (centrifuge, bacterial culture) for detective work, with Sandy and Jill eagerly questioning the science.
  • Jill: "It sure makes enough racket." (01:24)
  • Dr. Tim Detective: "This centrifuge separates the lighter from the heavier... in this case, the bacteria I'm hoping to find from the solution they grew in." (01:38)
• Educational moment: Dr. Tim uses a chicken egg as a culture to test bacteria viability (02:13).

The Alarm: Dr. Jarvis Calls for Help

• Dr. Jarvis reports an outbreak: "Fourteen calls during the last hour and all from your part of town. Food poisoning, I think." (03:04)
• Dr. Tim and his assistants are enlisted to investigate, using both medical and detective techniques.
  • Dr. Jarvis: "We're pretty short handed and something's come up I don't like at all. Right in your neighborhood." (02:53)

The Investigation: Interviewing and Data Gathering

• Sandy and Jill gather extensive food histories from patients.
  • Jill: "So you mean you'd like us to get a complete list of everything that people ate today?" (04:15)
  • Dr. Tim Detective: "Exactly. And then by putting those lists together, we ought to find that all of them had one kind of food somewhere along the line. Or ate at the same restaurant, perhaps." (04:19)
• Key method: Compare food lists to uncover a common factor among the cases.

The Lab Breakthrough: The Culprit Germ Identified

• Dr. Tim isolates the cause in his lab:
  • Dr. Tim Detective: "Well, here's the criminal." (07:04)
  • Dr. Jarvis: "Nasty little germs." (07:06)
  • Jill: "What? Salmonella." (07:12)
  • Dr. Tim Detective: "I suppose it accounts for more food poisoning than all the other bacteria put together." (07:13)

Hitting a Wall: No Single Suspect Food Item

• Lists are compared—but there's no single food eaten by all victims.
  • Jill: "Well, there isn't any one food that everybody ate." (07:43)
  • Dr. Tim Detective: "It looks like a dead end from here." (07:57)
• Focus narrows to three suspects: hamburger, cream pie, and chocolate éclairs—links start to emerge.
  • Dr. Jarvis: "Those poisoned people had either hamburger in some form, cream pie, or chocolate éclairs. Doesn't make sense." (08:55)
  • Jill: "All the pastry, the cream pies and the chocolate éclairs came from one bakery. And we have meatballs, hamburgers, meatballs and tamale pie, all made with ground meat from the same butcher shop." (09:16)

The Break: Geographical Clues Lead to the Source

• All implicated stores—bakery, meat market, and drugstore—are neighbors in the same block.
  • Sandy: "That bakery and the meat market and the drugstore where the people ate are all right together just four blocks down the street." (09:30)
  • Dr. Jarvis: "Say, wait a minute." (09:39)

Classic Deduction Pays Off

• Dr. Tim realizes that rats and mice, common disease carriers, likely contaminated both the meat and the cream filling, which act as ideal bacterial cultures.
  • Dr. Tim Detective: "Well, Miss Dr. Jarvis could tell you as well as I, one of the commonest carriers of salmonella, the food poisoning bug, is rats and mice. A few of their droppings around a food store and, well, you've seen what happens." (11:40)
  • Dr. Tim Detective: "Two of the best cultures in the world for salmonella are cream fillings and ground meat, especially in a warm place like the bakery, or when left outside the refrigerator in a butcher shop." (12:10)
• Because the stores are adjacent, rodents could easily contaminate both locations, creating a multi-site outbreak.

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Notable Quotes and Memorable Moments

• Dr. Tim’s witty approach to detective work:
  Dr. Tim Detective: "Why, Doc Jarvis, you know us junior G men have given up disguises. The latest thing is to graft noses on us like a bloodhound." (03:20)

• Comic banter from Sandy and Jill:
  Sandy: "Yeah, I can see it just about as easy as a black sheep in a coal mine at night." (01:32)

• Educational takeaways:
  Dr. Tim Detective: "It's a way we scientific detectives have of finding out a lot of things." (02:13)

• Reasoning the outbreak source:
  Dr. Tim Detective: "So, figuring that adjoining buildings would offer plenty of opportunity for the same carriers to go back and forth freely, I apprehended the poisoners at large. It's a matter of get rid of the rats, get rid of the poisoners, and believe me, that's going to be done." (12:27)

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Important Segment Timestamps

• Science lesson: Centrifuge and bacterial culture – 01:21 to 02:39
• Outbreak reported by Dr. Jarvis – 02:50 to 03:55
• Discussion on data gathering – 04:15 to 04:41
• Lab discovery of Salmonella – 07:04 to 07:21
• Lists fail to reveal one food link – 07:43 to 07:57
• Stores identified as adjacent – 09:30 to 09:39
• Dr. Tim explains rat connection – 11:40 to 12:27

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Episode Tone & Style

The episode blends:

• Lighthearted humor (typical of mid-century kids' adventure shows)
• Straightforward scientific explanation, adapted for a young audience
• Classic sleuth-style logic and deduction
  Dialogue is snappy, playful, and carries a sense of camaraderie among Dr. Tim and his young assistants.

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Summary and Takeaways

"Doctor Tim - The Mystery of the Poisoner at Large" offers an entertaining blend of scientific inquiry and detective work. The case teaches listeners about food poisoning, the process of bacterial identification, and the importance of public health vigilance. The teamwork among Dr. Tim, Sandy, Jill, and Dr. Jarvis highlights both investigative rigor and engaging character dynamics. The solution—tracing the outbreak to unsanitary conditions fostered by rodents in adjacent shops—is logically and humorously presented, making science and safety come alive for listeners of all ages.

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Next Adventure Teased:
Dr. Tim signs off, promising further mysteries and inviting listeners to tune in next week for "The Mystery of the House that Jack Built."

Transcript

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[Dr. Tim Detective]

This is Dr. Tim Detective, to bring you, by transcription, the mystery of the poisoner at large. It isn't very often these days that you run across a case of wholesale poisoning. But when you do, well, there's never a dull moment until you've tracked the whole thing down. There's nothing worse than to be poisoned, whether you take the wrong medicine out of your medicine cabinet by mistake or whether it's fed to you by somebody else, as it was in this particular case, which came to my attention not so long ago. But I'd better start right at the beginning. Sandy and Jill, they're a couple of my very best friends and helpers, are watching me at work in my laboratory this particular evening. And as usual, the questions flew thick and fast.

[Sandy]

Sure, I get the general idea, but what's that machine for?

[Jill]

It sure makes enough racket.

[Dr. Tim Detective]

Well, as I was saying it's called.

[Jill]

That explains everything, I guess.

[Sandy]

Yeah, I can see it just about as easy as a black sheep in a coal mine at night.

[Dr. Tim Detective]

Okay, kid, I'll back up a little. You see, when you have several kinds of bacteria, or bugs, I guess you'd call them, or when you want to separate one part of a substance from another, you put them in a centrifuge, turn on the switch, the machine whirls them around at a few thousand revolutions per minute. Then what happens? Presto. Like this centrifuge separates the lighter from the heavier. In this case, the bacteria I'm hoping to find from the solution they grew in. And, well, here you are. Look for yourselves.

[Jill]

Hey, it works.

[Sandy]

I'll be dying now.

[Dr. Tim Detective]

I'll transfer these bacteria to a culture.

[Jill]

Here we go again.

[Dr. Tim Detective]

Well, a culture is merely something for the bacteria to grow in and feed from. In this case, I'm going to use the fertilized egg of a chicken. And if the experiment works, I'll soon know if these bacteria can live and grow in living tissue. At other times, the culture might be milk or sugar solution or even a bit of custard pie. It's a way we scientific detectives have of finding out a lot of things

[Sandy]

I don't see much detective work there.

[Dr. Tim Detective]

Yeah, you'd be surprised, Sandy. You'd be surprised. Hello?

[Dr. Jarvis]

Hello, Tim, is that you?

[Dr. Tim Detective]

Oh, hello, Jarvis. How are things down at the health department?

[Dr. Jarvis]

Well, we could sure use you right now if you grab the truck time. We're pretty short handed and something's come up I don't like at all. Right in your neighborhood.

[Dr. Tim Detective]

Well, anything serious?

[Dr. Jarvis]

14 calls during the last hour and all from your part of town. Food poisoning, I think.

[Dr. Tim Detective]

Any clues?

[Dr. Jarvis]

Not yet. Haven't had time to check thoroughly. Thought you might help there. Like to get out your set of false mustaches and do a little detective work.

[Dr. Tim Detective]

Why, Doc, do Jarvis, you know us junior G men have given up disguises. The latest thing is to graft noses on us like a bloodhound.

[Dr. Jarvis]

All right, anyway you please. Now, I'll give you a list of the names and addresses of everybody we have that's been reported so far and let you get to work your own way.

[Dr. Tim Detective]

A few minutes later, Sandy, Jill and I were mapping out our campaign. Now, some people think it's kind of funny for a combination doctor and detective to count on a couple of kids for help on a case. But let me tell you that those two are just about the most valuable assistance I have. In between phone calls reporting new cases of food poisoning, we outlined the problem and our work.

[Jill]

So you mean you'd like us to get a complete list of everything that's at people ate today.

[Dr. Tim Detective]

Exactly. And then by putting those lists together, we ought to find that all of them had one kind of food somewhere along the line. Or ate at the same restaurant, perhaps. In other words, you see, we need a common factor to start with.

[Sandy]

I get it. You're trying to track down where the food poisoning came from.

[Dr. Tim Detective]

Exactly. And that way we can stop anyone else from eating the contaminated food.

[Jill]

But gee, what is it? Arsenic or rat poison or something?

[Dr. Tim Detective]

Well, that's what I'm going to find out by careful laboratory analysis after I visit a couple of those sick people. However, I'm willing to bet that we'll find our old friends the bacteria at the bottom of it.

[Sandy]

Germs, huh?

[Dr. Tim Detective]

Yes. Well, let's get going, kids.

[Jill]

Okay, my list is milk and canned soup and cream pie. Oh, yes, Jackie Kim would like to know where you bought the pie. Or if so.

[Sandy]

So let's see if I have a bright. Mr. Adams, you and your wife ate hamburgers, canned pork and beans and drank coffee. Dr. Tim told me to ask you

[Dr. Tim Detective]

where you bought the handover.

[Sandy]

Rest of the things don't matter.

[Jill]

You can eat anything at home that r. Now I'm supposed to find out at which restaurant you ate.

[Sandy]

Thanks, I'll let you. Sure I have it right? Steaks, potatoes, fresh carrots and chocolate flair. You sure that's everything doctor wants?

[Dr. Jarvis]

For sure.

[Dr. Tim Detective]

By the time I arrived home after looking in on some of the patients, I had enough laboratory material to keep me busy for quite a spell. Samples of food from several homes, minute bits of waste from the patients, and lists similar to those Sandy and Jill were compiling. I went into my laboratory and sat down for a few moments to think. So far, nothing about the case made sense. Except that all those people did have food poisoning. No doubt about that. And some of them were mighty sick indeed. There'd be a lot more if we didn't track down the source of the trouble in a hurry. Stop anyone else from eating the germ laden food. Silently, I went to work. A few minutes later, Sandy and Jill were going over their lists of the food eaten by the poisoned patients with Dr. Jarvis. And as I adjusted my microscope for the umpteenth time, I found what I was looking for. I motioned the others over. Well, here's the criminal.

[Jill]

See? Let me see.

[Sandy]

Yeah, me too.

[Dr. Tim Detective]

They all peered into the microscope. Dr. Jarvis was the first to speak. Nasty little germs.

[Jill]

What? Salmonella.

[Dr. Tim Detective]

I suppose it accounts for more food poisoning than all the other bacteria put together. Doesn't kill very many people. It sure makes a lot of them plenty sick.

[Sandy]

Did you find out where it came from?

[Dr. Tim Detective]

Unfortunately, no. There aren't any samples of the food I've tested so far that show its presence. The bacteria you see under the microscope are from the stomach contents of one of the patients. We're not having too much luck ourselves. Like to hear the reports of the investigation. I think that's the next step. Okay, Jill, you've been keeping score. Suppose you start.

[Jill]

Well, there isn't any one food that everybody ate.

[Dr. Tim Detective]

Well, wouldn't you know it?

[Jill]

Oh, it's worse than that. There aren't even two kinds of food on everybody's list. I mean, you know, half of them. One thing and half another.

[Sandy]

It just plain doesn't make sense.

[Dr. Tim Detective]

It looks like a dead end from here. Well, let's do the best we can. Let's find the, say, the three items that appear oftenest in the list you've made and this might be a connection. First though, I think we can rule out canned food. Cuz there hasn't been any real trouble with commercially canned food for years. And it's Impossible that all those people ate the same home canned stuff that might have gone bad. This is going to be tougher than I thought. The results of our detective work were peculiar, to say the least. But we did prove one thing. There were three food items to be suspected because one of those three appeared in all the diets of the ones who ate at home. With a flourish of his pencil, Dr. Jarvis summed it up. Well, here we are. Those poisoned people had either hamburger in some form, cream pie, or chocolate eclairs. Doesn't make sense.

[Jill]

Wait a minute. I've got an idea. I've been working on the ones who laid out, and all of them had one of those two.

[Dr. Tim Detective]

Hold on a minute. Wait till you hear this one.

[Sandy]

I've been doing the stores and the restaurants. Everybody that ate out went to the

[Dr. Tim Detective]

drugstore down on the corner. This is beginning to add up to something. Let me see your list, Joe. No, no, no. The other one. Uh huh. All the pastry, the cream pies and the chocolate eclairs came from one bakery.

[Jill]

Oh, sure. And we have meatballs, hamburgers, meatballs and tamale pie, all made with ground meat from the same butcher shop.

[Dr. Tim Detective]

You're sure of that?

[Jill]

Uh huh.

[Dr. Tim Detective]

Now all we have to do is to chase all over town to those various stores trying to find out what and why.

[Sandy]

Gosh, no, you don't. Don't have to chase all over town, or even this end of it. That bakery and the meat market and the drugstore where the people ate are all right together just four blocks down the street.

[Dr. Jarvis]

Say, wait a minute.

[Dr. Tim Detective]

If that's true, Jarvis, I think we might have the answer. Let's get going fast. Come on, let's go. As we drove the short distance to the shopping center, I got to thinking. You know, it's a funny thing about mysteries, especially complicated ones like this one, where people scattered over a wide area all come down with the same illness at once. At first, things don't even make sense.

[Sandy]

Look.

[Dr. Tim Detective]

Impossible, you might say. And then with a bit of information added here and there, a dim pattern begins to take shape. That's exactly what happened in the poison mystery this time. Here's what we knew. Three food items caused those people to become deathly ill. Well, two, really. Because it occurred to me that the filling of cream pie and the filling of chocolate eclairs is the same. And the other was hamburger. Both items came from the same two stores. Those who had eaten at the drugstore had eaten either hamburger or the cream filling. What would be more logical than for the drugstore Food to be purchased at the butcher shop next door and the bakery two doors down. So the pattern was now clear. Only one part of the mystery remained. How could both the pastry and the hamburger become poisoned with the germs of salmonella? And as we drove up in front of the stores and parked, an almost forgotten item of my medical training popped into my mind. I was sure I had the answer. Well, as we gathered in my laboratory a little Later, Sandy, Jill, Dr. Jarvis and myself, we were a happy gang. There wouldn't be any more cases of food poisoning from that source at least. Lost in thought, I heard Sandy ask,

[Sandy]

but gee, Dr. Tim, how come you went right into those stores and started looking for rats?

[Jill]

He sure fooled me.

[Dr. Tim Detective]

Well, Miss Dr. Jarvis could tell you as well as I, one of the commonest carriers of salmonella, the food poisoning bug, is rats and mice. A few of their droppings around a food store and, well, you've seen what happens. Well, that's why we have inspections by the city and campaigns against rats and mice, even if you can't get results 100% of the time.

[Jill]

But why would just the Will the cream filling in the hamburger be full of germs?

[Dr. Tim Detective]

Well, you remember what I told you about cultures, the perfect material for bacteria to grow on?

[Dr. Jarvis]

Sure.

[Dr. Tim Detective]

Well, two of the best cultures in the world for salmonella are cream fillings and ground meat, especially in a warm place like the bakery, or when left outside the refrigerator in a butcher shop. It's the perfect setup for an epidemic like ours.

[Sandy]

But why do those stores, being right together, give you the idea?

[Dr. Tim Detective]

Elementary, my dear Sandy, elementary. It would be rather strange that two or three different sets of food poisoning would break out on the same day at widely separated spots. So, figuring that adjoining buildings would offer plenty of opportunity for the same carriers to go back and forth freely, I apprehended the poisoners at large. It's a matter of get rid of the rats, get rid of the poisoners, and believe me, that's going to be done. This is Dr. Tim detective saying so long until next week at this same time, when Sandy, Jill and I will bring you the exciting transcribed story I call the Mystery of the House that Jack Built.

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