Publisher's Synopsis
In this gripping mystery novel, wealthy businessman John Thorndyke is blackmailed by an unknown assailant who threatens to reveal a dark secret from his past. Thorndyke hires private investigator Augustus Van Dusen, known as the "Thinking Machine," to help him uncover the identity of the blackmailer. As Van Dusen follows a trail of clues, he finds himself in a race against time to save Thorndyke's reputation - and his life.
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