N or M?

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This novel, set during World War II, sees Tommy and Tuppence Beresford appointed as spies by the intelligence service. Their mission: to seek out the Nazis in disguise, a man and a woman from among the colourful guests at a seaside hotel.
FictionMarried peopleMysteryPrivate investigatorsTommy Beresford (Fictitious character)Tuppence Beresford (Fictitious character)Spy storiesLarge type booksFiction, mystery & detective, traditionalLondon (england), fictionEngland, fictionWorld war, 1939-1945, fiction