Inspector Duval comes to London to help crack the case of a socialite murdered during a jewel heist.

Paul Maxwell plays Craig Owen, an incarcerated criminal whose cellmate holds the secret to the valuable contents within a safe deposit box. When the cellmate dies, Owen breaks out of jail in search of the stash. Unable to open the box, the fugitive abducts Linda (Felicity Young), the dead man's daughter. Tension mounts as the girl plays for time to prevent her own demise.

A small time thief is recruited by a mobster to help with the racketeering. He doesn't like the job, but with the mob on his back, a femme fatale in his bed and a sick friend to care for, he will have to keep all his wits about him.