 A terrified typist rushes into Perry Mason s office pretending to be sent by a temp agency. The jewel importers on the floor above has been invaded. Later one of the partners, George Baxter (Jack Raine), is killed and another partner, Duane Jefferson (Alan Marshal), is charged. Perry defends Marshal, but the accused man is too gallant to name his alibi, a married woman. Such chivalry leads to a dramatic twist and an unexpected conclusion.