The Anchor-Ferrers arrive at their Monmouthshire home, only to be met by a gruesome surprise. In London, DI Jack Caffery receives a clue that could lead him to their rescue.

DI Jack Caffery accepts the Walking Man's mission. He must find the dog's owner, but his past gets in the way. Meanwhile, the Anchor-Ferrers' home invasion takes a terrifying twist.

As he probes further, Jack is convinced the Donkey Pitch killer is still at large. Meanwhile, in the house of horrors, Honey grows increasingly paranoid about them being watched.

Another creepy gift from Penderecki sets Jack off in a new direction, but questions remain over his theories. Meanwhile, Honey takes control of his predicament, only to find it is too late.

When Jack unearths a clue that leads him to the Anchor-Ferrers' home, the two narratives race forward on a nail-biting collision course.