Twenty years ago three young boys staggered out of an old building, tired and dirty yet otherwise unharmed. Missing for a weekend, the boys had no idea of where they'd been. But they all shared the same vague memory of a shadowed woodland grove...and they swore they'd been gone for only an hour. When Simon returns to the Concrete Grove to see his old friends and unearth painful memories from his childhood, things once buried begin to claw their way back to the surface. The hummingbirds are flying again, bringing a warning of something terrible. Bad dreams take on physical form and walk the streets of the estate. A dark, hideously patient entity is calling once again from the shadows, reaching out towards three terrified boys who have now grown into emotionally damaged men. And the past is about to catch up with them all, staining their lives with a darkness they could never truly escape. Welcome back to the Concrete Grove. The place you can never really leave...