By day, Ellie Power has a normal life. She has a stable home, a loving boyfriend, a future. But at night, she suffers from a sleep disorder. She becomes angry, unpredictable, violent. Her mother locks Ellie in her bedroom every night, to keep them both safe. Then one morning, Ellie wakes up, horrified to find the lock on her bedroom door smashed from the inside. She is covered in injuries, unable to remember anything about the night before. And her boyfriend Matt is nowhere to be found... 'Intricately plotted, beautifully written' , author of 'This ambitious and wide-reaching novel had me hooked from the very first page' 'One of the best debuts I have ever read' 'A flawlessly written, jaw-dropping, chilling and twisty psychological thriller' 'A disturbing psychological thriller' 'The characters are fresh, the dialogue sharp' 'A stunning debut. Gripping, compelling and skilfully crafted'