Collection of four film noir features. In 'The Dark Mirror' (1946), after a man is found with a knife in his back, Detective Stevenson (Thomas Mitchell) narrows his list of suspects down to identical twin sisters Terry and Ruth (both played by Olivia de Havilland). When psychologist Scott Elliott (Lew Ayres) is then enlisted to help sort good sister from bad, a psychotic tale of sibling rivalry unfolds. 'Secret Beyond the Door' (1947) follows Celia (Joan Bennett) as she meets millionaire Mark (Michael Redgrave) whilst on holiday and decides to get married despite knowing very little about her new man. Her worst fears are confirmed on their honeymoon when Mark suddenly becomes cold towards her, leaving Celia fearing for her safety. 'Force of Evil' (1948) follows Joe Morse (John Garfield), the fast-talking lawyer of crime boss Ben Tucker (Roy Roberts), who keeps one eye on his small-time crook of a brother who runs a numbers' racket. When Tucker decides to force his brother out of business, Joe's loyalties are split. Finally, in 'The Big Combo' (1955) gangster Mr. Brown (Richard Conte) begins a passionate relationship with society woman Susan (Jean Wallace). Mr. Brown soon runs into trouble with detective Leonard Diamond (Cornel Wilde) however, who is obsessed with destroying Brown's criminal empire and winning the heart of Susan in the process.