Unremembered by Jessica Brody

Violet (Sera) is found in the ocean after a terrible plane crash.  She is the only survivor and has no injuries.  How could this be?  She has no memory at all past or present even her name.  Who is she and who is the boy that keeps confronting her saying he is her friend?  And then, people start chasing her and seem to want to harm her.  Violet does not know who she can trust.  I really enjoyed this YA book but I hope it's not the last one.  Ms. Brody left too many unanswered questions.