N or M?

Agatha Christie sends Tommy and Tuppence Beresford back into action during the darkest days of WWII. Somewhere in a sleepy English seaside town, Nazi agents N and M are plotting—and our favourite married sleuths must go undercover to smoke them out. It's vintage Christie: red herrings, brilliant misdirection, and that satisfying snap when everything clicks into place. Perfect for fans of clever wartime espionage wrapped in cosy crime fiction.