William Gamble 
Cave of Voices 

Aeron Kline is your usual 15-year old amnesia victim. After waking up in the hospital, with the past two years of his memory missing Aeron is plagued with mysterious visions and a vague voice that warns him with the words This is your second chance, make the most of it. With no way to regain his lost past he pushes on with his life.
But it would seem that fate has a different plan for Aeron when a year later he begins to see mysterious strangers that begin to trigger more of the visions, and to make things even stranger he comes face to face with the urban legend of his hometown. The skeleton man Everet- who is somehow connected to his missing memories- and who awakens a dormant power inside Aeron. Now, with his newfound powers Aeron Kline must fight for his missing fragments and possibly something greater; the fate of an entire world.