With the help of government-issued pamphlets, an elderly British couple build a shelter and prepare for an impending nuclear attack, unaware that times and the nature of war have changed from their romantic memories of World War II.

England, World War II. Quint Munroe, RAF officer and new leader of a Mosquito squadron, is tasked with destroying a secret Nazi base in France while trying to overcome the disappearance of a brother-in-arms.

Prudence Hardcastle is on the pill. So is her sister-in-law, but someone has been swapping aspirin for their pills. Is it the teenage niece, the maid, the chauffeur, a lover, Prudence's husband Gerald, or all of the above?