The Unknown poster
Where to stream

The Unknown

6.319461h 10mMovieMysteryThrillerHorror

"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.

DirectorHenry Levin
WritersJulian Harmon·Malcolm Stuart Boylan
ProducerWallace MacDonald

Where to watch

Availability shown for United States · rights vary by country

Cast · Directed by Henry Levin

Karen Morley
Karen Morley
Rachel Martin
Jim Bannon
Jim Bannon
Jack Packard
Jeff Donnell
Jeff Donnell
Nina Arnold
Mark Roberts
Mark Roberts
Reed Cawthorne (as Robert Scott)
Robert Wilcox
Robert Wilcox
Richard Arnold
Barton Yarborough
Barton Yarborough
Doc Long
James Bell
James Bell
Edward Martin
Wilton Graff
Wilton Graff
Ralph Martin
Helen Freeman
Helen Freeman
Phoebe Martin
Robert Kellard
Robert Kellard
James Wetherford (as Robert Stevens)
J. Louis Johnson
J. Louis Johnson
Joshua (uncredited)

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The Unknown — streaming FAQ

Which OTT platform streams The Unknown?

The Unknown isn't on any subscription service in United States right now, but you can rent or buy it on Amazon Video, Google Play Movies and YouTube. It's not on Netflix.

Is The Unknown on Netflix?

No, The Unknown is not on Netflix in United States as of August 2026. You can rent or buy it on Amazon Video and Google Play Movies.

Is The Unknown on Amazon Prime Video?

The Unknown isn't included with a Prime Video subscription in United States, but you can rent or buy it on Amazon Video.

Where can I watch The Unknown for free?

The Unknown isn't available free in United States; you can only rent or buy it on Amazon Video and Google Play Movies.

Is there a sequel to The Unknown?

The Unknown is currently the latest film in the I Love a Mystery Collection.

Is there a prequel to The Unknown?

Yes — The Devil's Mask (1946) comes before The Unknown in the I Love a Mystery Collection.

Is The Unknown part of a trilogy?

Yes — The Unknown is part of a trilogy, alongside I Love a Mystery (1945) and The Devil's Mask (1946).

How many movies are in the I Love a Mystery Collection?

There are 3 films in the I Love a Mystery Collection: I Love a Mystery (1945), The Devil's Mask (1946) and The Unknown (1946).