'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.

'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.' ¿¿¿¿¿

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'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.' ¿¿¿¿¿

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

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

'Amazingis all I can say - I loved it!' ¿¿¿¿¿