A criminal psychologist puts her life on the line to stop a serial killer in this crime thriller by the international bestselling author.

In London, a young woman falls to her death from a balcony while trying to take a daredevil selfie. Or that's how it appears at first. Psychologist Samantha Willerby isn't so sure. Called in by the Metropolitan Police to examine a series of cold cases, Sam uncovers a chilling link between this victim and two others: they each had their hair hacked off exactly seven days before they died.

Then Sam discovers another shocking connection-to herself. When she recognizes one of the victims, she's determined to crack the case no matter how many rules she breaks. But when her own hair is slashed, one thing becomes fatally certain: Sam has only seven days to catch a calculating serial killer before she becomes the next victim.