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George Baxter (Jack Raine), a courier for the South African Diamond Company, arrives at his firm's California office to find the place in a state of disarray, with a strange girl (Joanna Moore) standing the middle of the room. Baxter concludes that the place has been robbed, but before he can say or do anything the girl has ducked into the nearby office of Perry Mason (Raymond Burr), claiming to be a typist for a temp agency. Later on, Baxter is found murdered, and a man named Duane Jefferson (Alan Marshall) is charged. Perry wants to defend Jefferson, but the man refuses to identity the woman who could prove his innocence (and guess who that woman is?) Based on a 1956 novel by Perry Mason creator Erle Stanley Gardner, this episode offers a genuinely shocking twist just before the climax.