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Investment broker Eric Pollard (Lloyd Bochner) seems to have gone off his trolley when he begins suffering from dizzy spells; to begin with, he publicly charges his wife Sybil (Marian Moses) with every crime under the sun--and as a capper, he hires a taxi to rob a bank! Though he is thrown in jail, Eric receives a suspended sentence thanks to Sybil's probation-officer friend Roy Galen (Jason Evers). Far from grateful, Eric accuses Roy and Sybil of being lovers--and when Sybil is murdered, it is Roy who is arrested. In order to save an innocent man from the gas chamber, Perry Mason (Raymond Burr) must first find the real reasons behind Eric's nutty behavior.