S2·E15 The Case of the Foot-Loose Doll

Two troubled women, Millie Crest and Fern Driscoll, switch identities. Millie, posing as Fern, stabs shady private eye Carl Davis in the arm in self-defense. Davis then turns up dead from poisoning of the stab wound to his arm. Millie then gets Perry to help her in return for a 38 cent retainer.