'Deliciously dark and utterly compelling - I couldn't put it down.' - CLARE MACKINTOSH

They're locked up for your safety.

Now, you're locked in with them. How do you find a murderer in a prison full of killers?

On a locked ward in the world's highest-security prison hospital, a scream shatters the night.

A nurse has been murdered and her daughter has been taken.

And with only five days to find the girl, the clock is ticking for Dr Connie Woolwine to find a killer hiding in plain sight...

Welcome to The Institution. The locked room thriller readers don't want to leave.

'This is the best book I've read in years!'

'I don't think I have ever read anything that gripped me quite so intensely.'

'An absolutely mind-blowing suspense thriller.'

'Terrifyingly brilliant. An absolute must-read.'

'A book that evolves at break-neck speed, taking the reader on a spine-chilling journey.'

'If this book isn't a smash hit I'll claw my own eyes out!'

'Tense, exciting, heart-thumping action'

'Deliciously creepy, unflinching and addictive.'

'A first-class locked room thriller.'

'Gobsmackingly good!'

'Helen Fields' talent for creating atmospheric thrillers knows no bounds.'

'A real page-turner; what a ride straight from the outset. I felt physically chilled.'

'Chilling, claustrophobic and packed with twists and turns.'

'Original and innovative...a crackingly scary thriller.'

'Dark, atmospheric, creepy and hauntingly good. Kept me guessing until the end - I loved it.'

'Amazing is all I can say - I loved it!'