A young woman is framed for the murder of a wealthy man who met his death at the hands of his heirs.

Great Britain has had an international agreement for the last 50 years with a small pacific island. It has been ignored until the death of their king brings it to the attention of the Foreign Office in Whitehall. They decide to send Cadogan de Vere Carlton-Browne to re-establish friendly relations.

WPC Marie Watson goes undercover to infiltrate a gang of counterfeiters.