Overwhelmed by the mystery and turmoil of her twin sister's disappearance, Payton struggles with the reality of being the one left behind. Especially since she's unable to remember even the largest detail of what happened the day Dylan vanished. When sudden reckless outbursts throw her from the graces of popularity she worked so hard to achieve, Payton finds herself befriending the people on the outskirts--including her sister's old boyfriend, Cole, who she is growing closer to every day. When new clues are unearthed following the disappearances of two girls who look eerily similar to Dylan, Payton is determined to find her sister. And the more Payton pries open her blocked memories in an attempt to find answers, the farther down the path of danger she heads. As the darkness surrounding her sister's disappearance grows, and the truth of what really happened begins to surface, Payton's search might cost her everything.