Tommy & Tuppence Mysteries N or M?: A Tommy and Tuppence Mystery: The Official Authorized Edition, Book 3, (Paperback)

Set during World War II, Agatha Christie s riveting novel in her Tommy and Tuppence series follows the unlikely espionage agents as they pursue a pair of Nazi spies who have murdered Britain s top agent now a movie on both Acorn TV and PBS.

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 spies, Tommy and Tuppence Beresford. Their mission: to seek out a man and a woman from among the colorful guests at Sans Souci, a seaside hotel. But this assignment is far from an easy stroll along the promenade N and M have just murdered Britain's finest agent and no one can be trusted."