Dan Holiday, a mystery novelist who advertises for adventure, receives a cryptic letter instructing him to make an appointment with Dr. Ogden and then call a mysterious Mr. Alexander. The letter hints at danger and promises excitement. Upon meeting Dr. Ogden, Holiday is asked to write his name and a message on a slip of paper. When Ogden reads the name "Matthew Carey," he reacts with shock and fear, demanding Holiday leave immediately. This name is linked to an unsolved murder case, and Holiday soon realizes he has been drawn into a dangerous game of deception and revenge. Mr. Alexander, who has been guiding Holiday through this mystery, later reveals that he is actually Philip Carey, the brother of the murdered Matthew Carey. Philip has been hunting Dr. Ogden, who is secretly Marvin Smith, the prime suspect in his brother’s murder. Philip orchestrates a plan to make Ogden believe he is being blackmailed, hoping to force a confession or a fatal mistake. The climax unfolds when Ho...