Colleen of Fiction/AV/Teen Services recommends The Unbecoming of Mara Dyer by Michelle Hodkin:
The Unbecoming of Mara Dyer begins with Mara’s life before the accident, living in Rhode Island and dealing with normal teenage problems. However, this all changes when Mara wakes up in a hospital room surrounded by her family and learns that there was an accident. A building collapsed and Mara was the only survivor. Her best friend Rachel, the new girl Claire, and her boyfriend Jude are all dead and Mara can’t remember anything about that night. Traumatized and left with hallucinations thanks to her PTSD, Mara does anything she can to try to hide her anguish. However, when you hallucinate the dead, it is hard to hide it. Essentially, The Unbecoming of Mara Dyer is a mystery. The reader is left to figure out what happened the night that Mara’s friends died and what is it about that night that is causing Mara to have post traumatic stress disorder.