Mara wakes up in the hospital, mostly unharmed after an accident that killed her best friend, boyfriend, and his sister. She has no memory of the event but slowly disturbing images start coming back to her. She starts having hallucinations (or maybe they are something more?) as she is trying to navigate a new school, new state, new life, new boyfriend.
You're never quite sure if Mara is going crazy or if there's something sinister and perhaps paranormal going on, which makes for a very exciting read. This is the first in a series and you'll definitely be clamoring for the next book after you finish this one.