A woman is plunged into a bizarre case of stolen identity in this ambitious and riveting thriller by the blockbuster bestselling author of The Good Girl, Mary KubicaJessie Sloane is on the path to rebuilding her life after years of caring for her ailing mother. She rents a new apartment and applies for college. But when the college informs her that her social security number has raised a red flag, Jessie discovers a shocking detail that forces her to question everything she's ever known.Finding herself suddenly at the centre of a bizarre mystery, Jessie tumbles down a rabbit hole, which is only exacerbated by a relentless lack of sleep. As days pass and the insomnia worsens, it plays with Jessie's mind. Her judgment is blurred, her thoughts hampered by fatigue. Jessie begins to see things until she can no longer tell the difference between what's real and what she's only imagined.Meanwhile, twenty years earlier and two hundred and fifty miles away, another woman's split–second decision may hold the key to Jessie's secret past. Is Jessie really who she thinks she is? Has her whole life been a lie? The truth will shock her to her core…if she lives long enough to discover it.