Float (The Chronicles of D.E.A.D. High)

What if your only memory is of who you aren’t, not who you are? Seventeen-year-old Rashelle Santos fights her way out of a coma to find she doesn't remember her life, except for her parents and dog. Brain damage doctors tell her, but Rashelle knows with absolute certainty that Shellie (her nickname) died at the bottom of Kaweah Lake, bequeathing her death memories to Rashelle. Rashelle leaps into a relationship with Shellie's boyfriend, Aiden Brody, because he stirs her feelings and fills the void within her. As their relationship becomes serious, she questions whom he really loves. When threats appear in the form of notes stuffed into her locker and calls in the night, Rashelle wonders if she can stay alive long enough to discover who wants her dead, because somewhere out there Shellie's attacker watches and waits to finish what he started. And what the hell, she wonders, is she deranged or could dead Shellie be lingering to keep her alive?