In this third Eamon Cowan story, a number of very ill and elderly people are found dead at home. While their deaths were expected, in each house the investigators find a drawing, a picture like a memory palace, incorporating some objects from the dead person's house. While puzzling over this, Penny, Eamon's wife, is called to the UK to help in tracking down a murderer in her parents' home town. When she returns, more dead bodies appear, and it is clear a serial killer is at work. Despite a profusion of clues, the pursuit of the killer is going nowhere, until one spectacular and final death leads to the murderer being unmasked.
