S1·E20 The Case of the Lonely Heiress

Heiress Marilyn Cartright places an ad in a magazine in order to find love and companionship. In reality, Marilyn is looking for the con artist who swindled and drove her sister to suicide. Marilyn eventually finds the man, Charles "Country Boy" Barnaby, and turns on her ample charm in his direction hoping to get the goods on him. But when Barnaby is found poisoned to death the police theorize that Marilyn killed him as an act of revenge.