Sophie Duguet --- young, successful and happily married --- thought at first she was becoming absentminded when she started misplacing her mail and forgetting where she'd parked her car the night before. But then, as her husband and colleagues pointed out with increasing frustration, she began forgetting things she'd said and done, too. And when she was detained by the police for shoplifting, a crime she didn't remember committing, the confusion and blackouts that had begun to plague her took on a more sinister cast. Her marriage started to come apart at the seams.

Now Sophie is in much deeper water: the young boy she nannies is dead while in her care, a tragedy of which she has no memory. Afraid for her sanity and of what the police will do to her when the body is discovered, Sophie goes on the run, changing her identity and appearance to evade the law. Forced to lead a very different kind of life, one on the margins of society, Sophie wonders where everything went wrong.

Still, with a new name and a new life, she hopes that she'll be able to put her demons to rest for good. It soon becomes clear, however, that the real nightmare has only just begun.