An abandoned building. A dank cellar. And inside it, a cage of bones―with a shocking surprise lurking within.Into the house. Down the stairs. Through the dripping dark of the cellar. Someone is there. Someone that 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 Detective Inspector Phil Brennan 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 reeling in terror,Brennan and Marina race to expose a predator more soullessly evil than any they’ve ever faced―and one who is hiding in plain sight.