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Perry Mason (Raymond Burr) is taken by surprise when a young woman (Mary Mitchell) sweeps into his office, begging him to "identify" her. Claiming to be Dorrie Ambler, the girl explains that she has been hired by private eye Joe Billings (Paul Lambert) to pose as her lookalike, heiress Minerva Minden, allegedly to verify if Minerva was involved in a hit-and-run accident. It turns out, however, that Dorrie really is Minerva, and that Billings is blackmailing her. Before long, Perry is not only defending Minerva on a charge of murdering Billings, but also of bumping off the "real" Dorrie Ambler, who may or may not have perished in the accident. Wesley Lau makes his farewell appearance as Lt. Anderson in this final episode of Perry Mason's eighth season, which is based on a novel by series creator Erle Stanley Gardner.