Postern of Fate

Tommy and Tuppence Beresford have just become the proud owners of an old house in an English village. Along with the property,they have inherited some worthless bric-a-bracincluding a collection of antique books. While rustling through a copy of The Black ArrowTuppence comes upon a series of apparently random underlinings. Howeverwhen she writes down the lettersthey spell out a very disturbing message: \