FBI Agent Dave Elliott (Donald Cook) is after gangsters. When his partner Arnold (Reed Howes) is killed in an operation he goes undercover in a numbers racket, via the rather dopey Regan (Warren Hymer), in order to find out who is the brains behind the outfit.
Once inside the gang Dave falls in love (of course) with the boss' secretary Maxine (Evalyn Knapp). He gains the confidence of the gang though one of them - Lefty Tate (J. Carrol Naish) - seems to find him rather familiar. Another complication comes when he bumps into an old college friend whose father turns out to be the big boss of organised crime JW (Herbert Rawlinson)...
Although nothing that original this is an entertaining fast moving (especially the last few minutes) crime movie. Snappy dialogue, some genuine charisma between Dave and Maxine and some decent action scenes elevate this film above the ordinary.