In a twist of fate, James Lake Junior disappeared mere days after his tenth birthday. His body was never found. Five years later, Atlas is just a normal teenage boy, who just happens to work for a murderous secretive organization of shape-changing trolls. It's not so bad though. The healthcare is free at least. Until he finds a magical amulet. Suffice to say, things get...interesting. (Trollhunters AU, Jim=Atlas, Half changeling !Jim)