Tommy and Tuppence must use all of their ingenuity to save not only their own lives, but the life of a mystery woman named Jane. Where is Jane Finn? The mere mention of her name produces a very strange reaction all over London. Agatha Christie electrifies the reader with a tale of international espionage, kidnapping, and murder.

Set during the dark days of World War II, Agatha Christie's N or M? puts two most unlikely espionage agents, Tommy and Tuppence Beresford, on the trail of a pair of Nazi spies who have murdered Britain's top agent. World War II is raging, and while the RAF struggles to keep the Luftwaffe at bay, Britain faces a sinister threat from "the enemy within"-Nazis posing as ordinary citizens. With pressure mounting, the intelligence service appoints two improbable...

Tommy and Tuppence Beresford buy a home and find that they have also acquired a mystery which, with typical enthusiasm, the two set out to solve.