When five corpses are found chained to the walls of a kitchen garden, Hennessey and Yellich quickly begin their investigation. The recently deceased owner of the house was housebound for the last 25 years, and so would have had no idea of the appalling crimes taking place yards away. At first, there doesn't seem to be much to go on, but Hennessey and Yellich know that the dead must hold the clues they need . .