Amateur sleuth Ellery Queen learns the truth about a businessman's two long-lost daughters.
| Actor | Role |
|---|---|
 William GarganEllery Queen | Ellery Queen |
 Margaret LindsayNikki Porter | Nikki Porter |
 Charley GrapewinInsp. Queen | Insp. Queen |
 Ralph MorganAlan Rogers | Alan Rogers |
 Kay LinakerMargo Rogers | Margo Rogers |
 Edward NorrisStewart Cole | Stewart Cole |
 James BurkeSgt. Velie | Sgt. Velie |
 Addison RichardsLester Younger | Lester Younger |
 Charles JudelsCorday | Corday |
 Andrew TombesBates | Bates |
 Claire Du BreyHousekeeper | Housekeeper |
 Micheline CheirelMarie Dubois | Marie Dubois |
 Ben WeldenFisherman | Fisherman |
 Milton ParsonsButler | Butler |
 Charles LaneCoroner | Coroner |