The film follows a woman who attends a staged séance only to find herself possessed by the spirit of an executed murderess.

Meanwhile, heiress Roma Courtney is contacted by Bavian, who claims her recently-deceased twin brother, John, wants to send her a message.

Bavian tricks Roma into believing her brother was murdered by Hammond, manager of the Courtney estate.

When Rogen's eyes open, the shocked couple are asked to leave the lab as Dr. Houston explains what he is attempting to do.

Exposed, Bavian runs and as he tries to leave, Rogen's spirit follows and wraps a rope around his neck, hanging him.

Film scholar Edmund Bansak views Supernatural as a precursor to Cat People (1942), as it employs a "female predator whose killing instincts are triggered by sexual passion.

[3] The 1933 Long Beach earthquake hit while filming which caused the cast and crew to run from the studio set shrieking in fright.

[13] Due to the film's sexual content, it was rarely aired on television, similar to Island of Lost Souls and Murders in the Zoo.

[6] The New York Times praised the acting of Lombard and Dinehart as well as that the film "succeeds in awakening no little interest in its spooky doings.

[13] In retrospective Kim Newman described the film as a "a fascinating mix of the bizarre and the conventional, affords Carole Lombard one of her strangest roles".

[14] Newman added that Randolph Scott was miscast, stating that he "stands around in a tux as Roma's dull love interest"[14] Newman also commented on Garnett Weston's script that was "an idea more impressive in concept than the execution" and that it contained "too many drawing-room chats between more interesting low-life material.