Into the house. Down the stairs. Trough the dripping dark of the cellar. Someone is there. Someone who shouldn't be there. As a building awaits demolition, a horrifying discovery is made inside the basement: a cage made of human bones with a terrified, feral child lurking within. Unbeknownst to DI Phil Bernnan and psychologist Marina Esposito, they have disturbed a killer who has been operating undetected for thirty years. A killer who wants that boy back. But the cage of bones is also a box of secrets - secrets linking Brennan to the madman in their midst. With the death toll rising and the city in terror, Brennan and Marina race to expose a predator more soullessly evil than any they've ever faced. One who is hiding in plan sight.