They're locked up for your safety.Now, you're locked in with them.Dr Connie Woolwine has five days to catch a killer.On a locked ward in the world's highest-security prison hospital, a scream shatters the night.

The next morning, a nurse's body is found and her daughter has been taken. A ransom must be paid, and the clock is ticking.Forensic profiler Dr Connie Woolwine is renowned for her ability to get inside the mind of a murderer. Now, she must go deep undercover among the most deranged and dangerous men on earth and use her unique skills to find the girl - before it's too late.But as the walls close in around her, can Connie get the killer before The Institution gets her?A claustrophobic, haunting crime thriller that will keep you up at night, perfect for those who couldn't put down The Sanatorium and Amy McCulloch's Breathless.