The Institution by Helen Fields

To beat them, she'll have to join them.

On a locked ward in the world's highest-security prison hospital for the criminally insane, a nurse has been murdered and her newborn baby kidnapped. 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 baby – before it's too late.

She has five days to catch the killer.

But with the walls of The Institution closing in on her, will her sanity last that long?