The squawks of an exceedingly profane parrot had led fishermen to the remote mountain cabin of millionaire Fremont C. Sabin. Sabin was a millionaire with a bullet through his heart. The ancient, short-barreled derringer found in the cabin was obsolete, but it could still blow a hole between a man's ribs. The parrot was in bad shape too—hungry, angry, and swearing like a mule-skinner. Sabin's parrot, Casanova, had been a genteel bird, with a refined line of chatter. Sabin's son claimed that the parrot found in the cabin was not Casanova. That, and the derringer, were the clues Mason had to go on...