An impossible crime that baffled even Agatha Christie, Cicely Disappears is a witty standalone country-house mystery by Anthony Berkeley, originally published under the pseudonym A. Monmouth Platts. First serialized as an interactive newspaper puzzle, this ingenious Golden Age whodunit invites readers to examine the fair-play clues and seek the solution alongside its charming amateur sleuths, Stephen Munro and Pauline Mainwaring.

An evening intended for bridge takes an unsettling turn when the eccentric guests gathered at Wintringham Hall decide to hold a séance. The lights go out. A strange voice fills the darkened room. Someone screams—and when order is restored, Cicely has vanished.

The company initially dismisses her disappearance as an elaborate prank, while their formidable host refuses to involve the police. Former First World War officer Stephen Munro, however, is unconvinced. Joining forces with the spirited and resourceful Pauline, the duo begins an investigation involving conflicting alibis, concealed motives, secretive servants, locked rooms, and romantic entanglements. When a suspicious death transforms the game into a deadly serious affair, the unlikely detectives must discover what happened to Cicely—and whether a murderer is hiding among the houseguests.

Perfect for fans of Agatha Christie, Dorothy L. Sayers, Ngaio Marsh, Margery Allingham, and E. C. R. Lorac, as well as readers who enjoy country-house mysteries, locked-room puzzles, amateur sleuths, supernatural misdirection, aristocratic period dramas, and classic British detective fiction. Ideal for libraries, book clubs, and collectors of vintage crime novels.