Prologue

Ever since Luca and Ava were five, they were always by each other's side. They cared about each other very much, and vowed that they would always be friends. But when Luca and Ava were eleven, Ava had went missing. Luca had searched everywhere for her, but there was no of where she had gone. Four years later, when Luca is in danger, a dark angel saves him.