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The Case of the Solid Key (Fergus O'Breen, Bk 3)
The Case of the Solid Key - Fergus O'Breen, Bk 3 Author:Anthony Boucher Blackmailer, fraud, and all-round crook, Lewis Jordan deserved to die -- and he did, violently. But private eye Fergus O'Breen had a secret assignment tied to Jordan -- and that meant he had to expose the killer nobody wanted to find.
Written in 1941.