Film censor Enid takes pride in her meticulous work, guarding unsuspecting audiences from the deleterious effects of watching the gore-filled decapitations and eye gougings she pores over. Her sense of duty to protect is amplified by guilt over her inability to recall details of the long-ago disappearance of her sister, recently declared dead in absentia. When Enid is assigned to review a disturbing film from the archive that echoes her hazy childhood memories, she begins to unravel how this eerie work might be tied to her past.

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.