I Know You Remember by Jennifer Donaldson

Zahra Gaines is missing.

After three long years away, Ruthie Hayden arrives in her hometown of Anchorage, Alaska to this devastating news. Zahra was Ruthie’s best friend–the only person who ever really understood her–and she vows to do whatever it takes to find her.

Zahra vanished from a party just days before Ruthie’s return, but the more people she talks to, the more she realizes that the Zahra she knew disappeared long before that fateful night. Gone is the whimsical, artistic girl who loved books and knew Ruthie’s every secret. In her place is an athlete, a partier, a girl with secrets of her own. Darker still are the rumors that something happened to Zahra while Ruthie was gone, something that changed her forever…

As Ruthie desperately tries to piece together the truth, she falls deeper and deeper into her friend’s new world, circling closer to a dangerous revelation about what Zahra experienced in the days before her disappearance–one that might be better off buried.