At the height of World War II, the Germans discover that a certain British personage is to stay at the country house of Lord Buckley. They devise a plan whereby they will kidnap the real Lord Buckley, and send to England an actor who will masquerade, lie in wait for the visitor with a number of gunmen, and take him back to Germany.

Lots of slogans such as "Be like Dad, Keep Mum" and "Keep it under your Hat" are visible on the walls in various scenes to reinforce the plot of this British wartime movie illustrating how gossipy talk can result in unknowingly giving valuable information to Nazi spies.