The Unknown Will Tonight Bring Her...LOVE or DEATH? "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. Details Casts Galleries Posters Title The Unknown Release Date 1946-07-04 Runtime 01 Hours 10 Minutes Genres Mystery Thriller Horror Production Companies Columbia Pictures Production Countries United States of America Karen Morley... Rachel Martin... Jim Bannon... Jack Packard... Jeff Donnell... Nina Arnold... Mark Roberts... Reed Cawthorne (as Robert... Robert Wilcox... Richard Arnold... Barton Yarborough... Doc Long... James Bell... Edward Martin... Wilton Graff... Ralph Martin... Helen Freeman... Phoebe Martin... Robert Kellard... James Wetherford (as Robe... Original Size (1280x720) Original Size (1000x1500) Original Size (1000x1500)