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The reporters hit one dead end after another. They’re starting to lose hope that they’ll ever land the story, when they get a breakthrough. A private library on the coast of England could hold answers they need.

Read the Investigations team's notebook here: www.telegraph.co.uk/callbethel |

For 30 days’ free access to The Telegraph: www.telegraph.co.uk/bethelpodcast |

If you have any information that could help the investigation, you can email the team on callbethel@telegraph.co.uk

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