Two men working on the docks close to London's Tower Bridge find the body of an unidentified man floating in the Thames. The police later identify the body to be that of a diamond courier from Holland. The police have to find his murderer, as well as the missing diamonds he was carrying.

Reparto

Dermot Walsh

Alexander James

Sydney Tafler

Victor Skinner

Mary Germaine

Rose Reid

Guy Verney

Snow White

Hugh Morton

Inspector Cathie

James Raglan

Mr. Wynn

Derek Blomfield

Philip Reid

Nicolas Bentley

Collis

Arnold Marlé

Otto

John Serret

Delbos