The promise.

Eight years after her brother Jace and his girlfriend Riley died in a car crash, Avery is still haunted by her brother's last words - the promise that he'd come back for her. A promise he could never keep or ?...
Avery's world changes when a man around Jace his age shows up at her school. The man arrives with a shocking claim: he's Jace, back from the dead. Though skeptical, Avery believes him when he reveals details only Jace would know.
But she later finds out this was a big mistake.
Trigger warning: This book can contain violence, abuse, suicide.