Boat building father and son join the river patrol service and get caught-up in a spy ring.

An operation of counterfeit five pound notes is discovered at a variety theater, leading to murder during the performance.

Young heiress Margaret Yeoland is found unconscious on the Devonshire moors by a disillusioned author, Denis Marlowe. She tells him she has run away from her family, but is reluctant to reveal the full story. Intent on concealing her identity from her pursuers, Denis coerces her into marrying him. But when the body of Margaret's missing father is discovered, it leads Denis to suspect his wife of murder.

Robin Hood star Richard Greene plays an agent who goes to the French-Spanish border to round up some smugglers and counterfeiters after his brother is murdered. He is helped by singer Anouk Aimee, who he falls in love with.