 Frost investigates the murder of a 15 year old girl who disappeared while completing her newspaper round. He also has to look into vandalism at a local churchyard as Supt. Mullett fears it might be the work of satanists but it is also where the 15 year old s body is found. He also has to deal with Mrs. Compton who has been receiving threatening phone calls. The Comptons are dealers of rare books and keep a large and valuable inventory in their home. When Mr. Compton is killed in a house fire, Frost quickly has a prime suspect. Finally, Frost receives a visit from his late wife s sister who now lives in America and doesn t seem to be in any hurry to return.