Tommy and Tuppence Beresford have just become the owners of an old English house. Along with the property they have inherited a collection of antique books. Whe... » 

Tommy and Tuppence Beresford have just become the owners of an old English house. Along with the property they have inherited a collection of antique books. When looking through The Black Arrow, Tuppence comes upon a series of apparently random underlinings which spell out a disturbing message. «