Home can be the most dangerous place.

They had cameras, alarms, lights, even guard dogs. They had storm doors and locks on their windows. They knew martial arts, they had knives to hand, and one of them even had a gun. And he still got in . . .

A terrifying killer is haunting Glasgow's affluent suburbs invading homes and smothering people left on their own. The tabloids have a name for the murderer based on his method of folding the bodies into tiny spaces, as well as his uncanny knack of seemingly springing out of nowhere: Jack-in-the-Box.

Inspector Lomond has an impossible case to crack. The houses involved have state-of-the-art security systems and were all securely locked at the time of death. There is no evidence of forced entry, and video footage shows no sign of any intruders. How is he getting in? How is he getting out? And who will be next?