Gambit

From the audio case: "In this confounding whodunit, Wolfe breaks almost all of his rules. First, he overcomes his aversion to females and agrees to help young Sally Blount clear her father of murder. The police are sure Mathew Blount killed a chess opponent of the Gambit Club with a heavy dose of arsenic. Wolfe proposes four other suspects, but when one turns up dead he becomes so discombobulated that he neglects his orchids and skips lunch. Will Wolfe recover from his conniptions in time to save an innocent man?"
Audio Editions Mystery Masters
@1996 Books on Tape