A Radio 4 dramatization of the story of what happens to Tom when, as he lies in bed unable to sleep, the old grandfather clock in the hallway strikes 13. Creeping downstairs to investigate, he throws open the back door and crosses the threshold into a beautiful, magical garden.
When a woman's body is found in a North London flat clutching a bloodstained sliver of X-ray, DI Thorne discovers that the victim's mother had herself been murdered fifteen years before by the infamous serial killer Raymond Garvey. When more bodies and more fragments of X-ray are discovered, a horrifying picture emerges: a killer is targeting the children of Garvey's victims...