 In San Francisco, Claire Alison and Dick Benedict try to avoid Martin Selkirk, who wants to break up their romance. Selkirk finds them and breaks Benedict s jaw in a fight. In Los Angeles, Lorraine Jennings, Selkirk s former wife, contacts Claire offering help if Claire will testify on Lorraine s behalf in a custody battle over young David Selkirk. Claire contacts Perry Mason about the situation while Dick recuperates in the hospital. A mysterious shot is fired in the night, Ralph Jennings walks with a pronounced limp, and Selkirk is found murdered. When Claire is charged, Perry must deal with young David s deadly toy to solve the case.