When Gay Harkwicke and her fiance, Algy, investigate the mysterious Mr. Zero, who is blackmailing Gay's cousin, Algy ends up becoming the prime suspect in a messy murder, and Gay must find the true...
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Nero Wolfe can’t stand Leo Heller, a mathematician who uses operations research to solve mysteries and seems to be superseding Wolfe’s own reputation. But then Heller is murdered by one of his clients. He managed to leave a cryptic message that...