Disgraced ex-detective Barrabal (Edmund Lowe) has a chance to win back his job if he can discover the identity of 'The Squeaker', a jewel thief who has cornered the market by betraying other villains to the police. Barrabal suspects shipping manager Frank Sutton (Sebastian Shaw), but his plan to reveal him as 'The Squeaker' goes wrong when a jewel thief, Larry Graeme, turns up and confronts Sutton with the truth. Sutton arranges for Graeme to be picked up by Scotland Yard, but he escapes. Sutton then kills him, and Barrabal finds himself arrested for the murder. An Alexander Korda production.