Among the peace and quiet of the rural English countryside, a young couple on a weekend camping break stop by a quaint village shop for supplies. As George enters, his girlfriend stuck outside talking to a local busy-body, he finds himself paralysed by shock, alone with the shopkeeper; a previously convicted man who groomed him as a child 22 years ago, Mr Amble.

In May 1940, the fate of World War II hangs on Winston Churchill, who must decide whether to negotiate with Adolf Hitler or fight on knowing that it could mean the end of the British Empire.