play_arrow Watch Now Amazon Videobuy, rentGoogle Play Moviesbuy, rentYouTubebuy, rentFandango At Homebuy, rentMysteryThrillerHorror6363play_arrow Watch Now Amazon Videobuy, rentGoogle Play Moviesbuy, rentYouTubebuy, rentFandango At Homebuy, rentMysteryThrillerHorrorthumb_upthumb_downThe UnknownJuly 4, 1946Directed byHenry Levin"The Unknown" was the final entry in Columbia’s I Love A Mystery series. A woman hires two detectives to keep her alive long enough to claim her inheritance.US content warning Last Updated: April 29, 2026 Request Update I Love a Mystery CollectionI Love a Mystery1945The Devil's Mask1946The Unknown1946 CastKaren MorleyRachel MartinJim BannonJack PackardJeff DonnellNina ArnoldMark RobertsReed Cawthorne (as Robert Scott)Robert WilcoxRichard ArnoldBarton YarboroughDoc LongJames BellEdward MartinWilton GraffRalph MartinHelen FreemanPhoebe MartinRobert KellardJames Wetherford (as Robert Stevens)J. Louis JohnsonJoshua (uncredited) Image Gallery RecommendedNight WatchThe HideoutNoceboBody CamThe Mirror Crack'dAll the Devils Are HereAbandonedThe InhabitantTrigger PointCleanerThe HauntedStowawayThe Lady VanishesThe Infernal MachineLast Man Down