The final Tommy & Tuppence novel.
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-brac, including a collection of antique books. While rustling through a copy of The Black Arrow, Tuppence comes upon a series of apparently random underlinings.
However, when she writes down the letters, they spell out a very disturbing message:M a r y โ J o r d a n โ d i d โ n o t โ d i e โ n a t u r a l l yโฆ