Wartime Britain: photos are stolen… a secretary is poisoned… a director is stabbed…

Who put the poison in blonde femme fatale Nita Prince’s coffee cup?

A hero returned from a secret mission visits his onetime colleagues (among them, Nigel Strangeways) at the Ministry of Morale. His former fiancée, the beautiful Nita, is now having an affair with the director, his brother-in-law…