The Stolen and The Gone

Cameron White's life turns around completely after her best friend, Piers Alexander, kills himself. She sees things that aren't really there, and has dreams that would never let her sleep soundly again. It's not long before she finds out that she's being hunted, and is taken to a promised safe haven where, just like her ,targets and victims of The Gones had been taken to. She meets new friends and helps them fight for their lives while also going through a life threatening experience. She finds herself perplexed by a boy who claims that he had lost everything because he had lost his memory at such a young age.
Is this boy telling the truth about who he is?
Was Piers's death really a suicide?