Shock (1946)

Starring Vincent Price, Lynn Bari, Frank Latimore, Anabel Shaw, Michael Dunne
Directed by Alfred Werker
(actor & director credits courtesy IMDB.com)

A young wife waiting for the return of her husband in a hotel room, witnesses a murder and falls into shock, but is sent for treatment to the sanitarium run by the murderer she witnessed.

A young Vincent Price is showcased in this suspense thriller, playing the murderer but giving a sympathetic performance as a man pushed too far by his less scrupulous lover (Bari, in an unusual role).  The film has some interesting camerawork, particularly a dream sequence where Shaw struggles to open an oversized-door with a tremendous knob to reunite with her husband, and a very creepy sequence in the middle of a thunderstorm where Shaw's room at the sanitarium is invaded by another patient, (chillingly portrayed by a mute but scary John Davidson).  The script, while setting up a nefarious scheme by Price & Bari to keep Shaw silent, throws various wrenches in their path as you might expect, leading to a somewhat predictable ending, but Price is ever watchable, adding another memorable characterization to his filmography.