A wealthy woman hires Mason to buy stock in her husband's land company, hoping to force his mistress out. But her plan goes awry when she is charged with murder.
Perry defends his client by invoking the constitutional provision of double jeopardy.
Jo Ann Blanchard seeks the help of Perry Mason when John Brant, a wealthy and crippled old man, takes her prize race horse as payment for a mortgage he holds on her property.
An old man seems to be giving his money away, something his nephew and wife try to stop by having him committed. But once he escapes from the sanitarium, he's accused of murder.
A secretary, who was harassed by the boss she once dated, has a solid alibi when he is killed. But his stepfather does not - and his fingerprints are all over the murder weapon.
