Rachel Cartwright has a terrifying condition. Every 48 hours, her eyes shut tight - and stay that way for two long days. She can't work, can't go out. And, worse, when the world goes dark, she's certain someone is watching her.

She can't prove it - but I believe her. And, as her doctor, I owe it to Rachel to help. I may not understand what's happening to her, but I've made it my job to protect her. To keep watch when she can't.

But I can't help but feel there's something Rachel's not telling me. A shadow in her past she won't talk about. And now... I'm starting to feel it too.

Like someone's watching me.

A heart-stopping psychological thriller from the author of THE WOMAN IN WARD 9, with twists that will leave you breathless.

Praise for THE WOMAN IN WARD 9:

'I inhaled The Woman in Ward 9. Such a clever, chilling and unputdownable thriller . . . with a killer twist that made me want to read it all over again' CLAIRE DOUGLAS

'Wrapped itself tighter and tighter around me until I could hardly breathe' S E LYNES

'Dark, twisted and razor-sharp. You'll be racing towards a nail-biting ending and then you'll want to read it all over again' LAUREN NORTH

'Keeps you guessing right until the last word. Don't expect to sleep if you take this one to bed' G. D. WRIGHT

'Dark, gripping, and utterly unputdownable . . . Prepare to be hooked!' EMILY FREUD

'Dripping with tension and a creeping sense of unease . . . an utterly gripping, mess-with-your-mind thriller' A A CHAUDHURI