When a goldfish collector turns up dead in his bathroom, the police are quick to arrest the beautiful Sally Madison. With a gun and stolen cash in her purse, she looks guilty as sin. But Perry Mason, the famed attorney, smells something fishy. He soon uncovers a tangled web of blackmail, jealousy, and greed that goes far beyond some rare fish. With his loyal secretary Della Street by his side, Mason must navigate hostile cops, lying witnesses, and a clever killer to keep his client off death row.