Vanessa Stockton and her best friend Eliza are inseparable. They're living the best years of their lives, enjoying high school, boyfriends and planning for their futures. All that changes, though, when Eliza goes out to a party and never makes it home. Months pass without a break in the case, until one day Vanessa wakes up . . . in Eliza's mind. Even more disturbing, she discovers she's woken up two days before Eliza goes missing. Vanessa has no choice but to relive her best friend's memories leading up to the disappearance and discover the truth about what happened before time runs out. But is the past set in stone? Or can Vanessa save her friend from an unspeakable fate?