Elderly Martha Beckett has been a prisoner in her own home, ever since her older brother disappeared when he was just nine years old. Playing hide and seek, he went down to the basement and never returned. And now Martha has vowed to protect everyone still alive from the evil that lurks beneath the floorboards. But whatever it is, it has woken up - and is hungry again... When Martha turns to the police for help, Annie Graham is the first to respond to her request. Now Annie Ashworth is happily married to fellow police officer Will, she has a luxurious home and a job she loves. But soon she learns about the escape of serial killer Henry Smith from a psychiatric clinic. When a severed head rolls out at her colleague Jake's feet, they immediately assume that Henry is back to his old tricks. Last time he nearly killed Annie, and this time she's willing to bet Henry wants to follow through. Now Annie must hunt down two monsters before they try to kill her again. But there is less and less time left...18+