A Monstrous Entity Has Broken Free… The North Ridge military base had been abandoned for fifty years, its rugged perimeter secured by miles of fencing and glinting coils of razor wire. Two young boys find a way inside the forbidden property. They discover tunnels and a secret laboratory, and by accident release an unimaginable evil. The nearby town of Kellsburg is suddenly plagued by a chain of ghastly murders, bodies savaged in a way the medical examiner says is impossible. People mysteriously disappear, and then return-as living abominations. As Kellsburg descends into chaos, Sheriff Greg Colvin and a handful of volunteers enter North Ridge, desperately seeking to discover who, or what, is causing the deaths. In shadowed chambers stained with the history of torture and inhuman experimentation, Colvin and his team confront a malignant horror beyond their darkest nightmares. Colvin's struggle to save himself, his town, and perhaps humankind itself, has just begun.