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.