A nightclub owner runs an all-woman robbery gang.

Vera Parkinson masterminds a bank robbery and, along with her sister Helen and accomplices Joyce Johanneson, Marie Williams and Agnes Clark, all disguised as men, steals $200,000. Upon their getaway, a trussed employee attempts to trip the alarm, causing Vera to pistol-whip him brutally. Vera and Joyce then bury the loot outside an abandoned shack, planning to let the case cool down for two years before they retrieve it. The next morning, at the nightclub Vera owns, Vera seduces a new delivery boy and then visits Agnes. Agnes, who is employed by the bank, has heard that the employee Vera wounded is in a coma, and is hysterical with fear that they will be caught. Vera soothes Agnes with sleeping pills but, while the girl is asleep, asphyxiates her with gas from the heater, then arranges the room so the death appears to be a suicide. She then visits Marie, a hairdresser who is concerned that Helen may be too young to handle the pressure of their secret. Vera, who is fiercely protective of her sister, dismisses Marie's fears. Meanwhile, Lt. Bill Hanley investigates Agnes' death by stopping by the club, where he finds himself attracted to Helen, who is practicing her singing act. When Vera returns, she appears convincingly aghast when informed of Agnes' death and agrees to testify at the inquest. Later, Vera loans Helen a skimpy dress to wear during her performance, but when she discovers that Bill has sent Helen a corsage, she orders her to stay away from the policeman. Bill comes to see Helen perform that night, and Marie, an alcoholic, pickpockets his wallet before Vera can warn her of his profession. Vera manages to return the wallet to him, and later maneuvers Helen so Bill cannot speak to her alone. At the end of the evening, Vera, Marie and Joyce go upstairs to Vera and Helen's apartment, where Marie mourns Agnes and Joyce worries about Bill's presence at the club. After Marie leaves, Joyce guesses the Vera killed Agnes, prompting Vera to threaten Joyce with a knife. At Agnes' inquest, Vera lies persuasively, then refuses Bill's offer to take her and Helen to dinner. When Bill looks for Helen at the club that night, however, the cigarette girl informs him that she is at the movies, and he is able to spirit Helen out on a drive without Vera's knowledge. The couple soon fall in love, and see each other in secret over the next few weeks. One morning, a drunken Marie visits Joyce and guesses that Vera has killed Agnes and will soon kill them, too. Joyce puts her to bed, then leaves for work as a masseuse. On the street, she spies Helen and Bill, and immediately informs Vera. To verify Joyce's story, Vera phones Bill's apartment and pretends to be a nurse calling to inform Helen that Vera has been hurt. Helen rushes home and, appalled to uncover the deception, proclaims that Vera cannot keep her away from Bill. Vera slaps her, causing Helen to rush to Bill's house. Joyce, who has witnessed the scene and is worried that Vera is allowing Helen too much liberty, borrows Vera's car and secretly follows Helen. At Bill's apartment, Bill comforts Helen and proposes, and in response she warns him that, after he returns from his upcoming business trip, she must tell him a story "that isn't pretty." She drops him off at the airport and drives home, not realizing that Joyce has damaged her tire. When Helen stops to examine the tire, Joyce, driving Vera's car, runs her over a cliff. The next morning, Vera discovers that Helen is missing and assumes that she has run off with Bill. Days later, Marie, drunk once again, confronts Vera, who she suspects is killing off the accomplices one by one. Marie insists on receiving her share of the loot, and although Vera agrees, she and Joyce later kill Marie. Upon returning to the club, Vera learns that Helen, who survive the crash, is in the hospital in a coma. She races to Helen's bedside, and when Helen awakens and blames Vera for trying to kill her, Vera realizes that Joyce is the culprit. As Helen reveals her involvement in the robbery to Bill, Vera chases Joyce to the shack, where the two struggle. Vera shoots Joyce, who manages to strangle Vera before dying. At the hospital, not knowing that the rest of the robbers are now dead, Bill reassures Helen that her cooperation with the police will earn her a suspended sentence, allowing them to marry.