Episode 18, "The Adventure of the Two-Faced Woman," begins with the stabbing murder of Mrs. Lillian McGraw (Dr. Joyce Brothers) as she's in the process of uncovering the identity of the artist of the portrait of herself that was done in Europe 25 years before, in 1922. That very day, at an auction attended by the ubiquitous Simon Brimmer (John Hillerman), she had purchased an original painting done by Sergio Vargo (Theodore Bikel), following a tip from Vargo himself in regards to the portrait he painted over. At that time, Lillian was attending school in Switzerland, an attempt by her wealthy parents to dissuade her from marrying her childhood sweetheart, Clint McGraw (Forrest Tucker), whose family was 'dirt poor,' as he himself later tells Ellery. It was the intervention of Clint's cousin, Celeste Wakefield (Vera Miles), that enabled Clint to finally marry Lillian, whose disastrous marriage to a drunken art dealer in Paris named Mueller ended with the latter's bloody ax murder, as perpetrated by the mysterious French painter known as Pierre Lazar, the very artist who rendered the portrait of Lillian as a young woman (and immediately disappeared without a trace). Edward Mulhare (THE GHOST AND MRS. MUIR) plays the shady auctioneer, whose art gallery is being investigated on charges of forgery by Inspector Claude Gravette (Alfred Ryder), of the French Surete. Victor Buono cameos as Dr. Friedland, the psychiatrist who was treating Mrs. McGraw for recurring headaches, and Woodrow Parfrey (1980's "Used Cars") shows up as Dr. Saltzman, working on behalf of the authorities to confirm the authenticity (or forgery) of the paintings.