The Unknown. Genre: Mystery, Thriller, Horror. Director: Henry Levin. Cast: Karen Morley, Jim Bannon, Jeff Donnell, Mark Roberts, Robert Wilcox. Release Date: 1946-07-04. Runtime: 70 minutes. Rating: 6.3/10. "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.

The Unknown