Desius Heiss (Oscar Homolka) is the French-born owner of an antique shop on Sly Corner who bears a grudge against society. His imprisonment and torture on Devil's Island has left him with scars down his back from repeated whippings. With little care for the authorities Heiss has allowed his shop to become a centre of criminal activity and enjoys a secret career as a receiver of stolen goods.His daughter Margaret (Muriel Pavlow) is a violin virtuoso and knows nothing of her father's criminal activities. But when the antique shop's assistant Archie Fellowes (Kenneth Griffith) discovers the illicit trade in stolen goods he threatens to blackmail Heiss. Desperate to keep his criminal activities a secret from his daughter Heiss decides to silence the blackmailer. But when Inspector Robson (Johnnie Schofield) takes a close interest in the Shop at Sly Corner Heiss must stay one step ahead of the police if he values his neck.