The Seventh Victim

The Seventh Victim is a 1943 horror and film noir starring Tom Conway, Jean Brooks, Isabel Jewell, Kim Hunter in her first film, and Hugh Beaumont, directed by Mark Robson, and produced by Val Lewton for RKO Radio Pictures. The film focuses on a young woman who stumbles upon an underground cult of devil worshippers in Greenwich Village while searching for her missing sister.

Mary decides to leave school to find her sister. She returns to New York City, and finds that her sister had sold her cosmetics business eight months earlier. She locates the apartment Jacqueline was renting and finds only a chair and a noose hanging from the ceiling in the otherwise bare apartment. This only makes Mary more anxious and determined to find her.Her investigation leads her to Jacquelines secret husband, Gregory Ward Hugh Beaumont a failed poet, Jason Hoag Erford Gage and a mysterious psychiatrist, Dr. Judd Tom Conway. Jacqueline had been Judds patient, seeking treatment for depression stemming from her membership in a Satanic cult called the Palladists. She was lured into joining the cult by her former coworkers. Mary enlists a private detective Lou Lubin to help in her investigation, but he is stabbed to death under mysterious circumstances. Judd helps her locate Jacqueline, who is hiding from the cult. Ward falls in love with Mary. Jacqueline is kidnapped by the cult members and condemned to death, because their rules state that anyone who reveals the cult must die. She would be the seventh person condemned under these rules since the founding of the cult hence the films title. ........

Source: Wikipedia