Kaylee Thompson lost the ability to sleep the moment her twin sister died in a car crash. As their mother spirals deeper into her own private grief and as her own grip on reality begins to shift, Kaylee makes a fateful decision and pretends to be her sister. Sleepless nights lead to midnight strolls, a strange boy named Rowan and an invitation to escape her desperation. Every night adventure they take makes Kaylee feel more and more like her true self. Too bad life has an in-your-face way of correcting itself, and soon Kaylee is forced to face a truth she never expected could ever be true.