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Michael Shayne becomes invovled with solving a murder while attending a private detective convention in Florida. He must work fast if he wants to stay ahead of the many rival detectives who are also out to solve it, one of whom could be the killer.
When a man named Henry Allerton, accountant for ganster Joel Moss, is killed while talking to Michael Shayne on the telephone, more than the police believe that a children’s book he was carrying may hold the clue to who killed him.
When columnist Greta Morgan is murdered while trying to contact Michael Shayne who was out on his boat, Shayne, blaming himself, determines to take the case and find the killer.