The Crimson Key is a 1947 American mystery film directed by Eugene Forde and written by Irving Elman, starring Kent Taylor, Doris Dowling and Dennis Hoey.

[1][2][3] Private detective Larry Morgan is hired by a Mrs. Swann to investigate her husband, who is soon found dead in the studio of Peter Vandaman, an artist.

Mrs. Swann is concerned about a missing key belonging to her husband.

Morgan encounters a receptionist, Miss Phillips, who was in love with Swann, and a man, Steven Loring, who suspected his wife and Swann of having an affair.

Loring's alcoholic wife, Margaret, mentions a Key Club with a special red key to a locker, but before he can check it out, Mrs. Swann is murdered and Morgan is beaten by thugs and nearly drugged by a woman named Heidi.