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Set in a 1950s Britain rising from the ashes of the Blitz into the grip of a new Cold War, our beekeeping duo stumble into a world of murder, undercover agents and cold war conspiracy. Tuppence is a woman who sees adventure round every corner, throwing herself head first into every mystery with passion and fervour, determined to get to the truth no matter what it takes, much to the dismay of her more cautious husband Tommy.
Tommy and Tuppence have a chance encounter on a train with an agitated young woman who suddenly disappears and never returns to her seat.
Tommy and Tuppence go undercover; he as a member of Brown's gang and she as a maid to a potential suspect.
The Beresfords search for Jane Finn comes to a close, as they uncover the identity of Mr. Brown.
Tommy is sent on a secret mission to discover the identity of Soviet spy staying at a seaside guest-house; Tuppence refuses to be left behind.
Tommy and Tuppence turn their attention to their fellow occupants of Sans Souci to find N.
Tommy has finally found the missing scientist, but they're both being held against their will by M, and still none the wiser as to who N is.
