For a mage, nothing is more important than keeping your word.

When a man Chance Fortunato swore to find turns up in Colombia, he must accompany a group of Sentinels, elite battle mages, to make good on his vow. But when what was supposed to have been a simple rescue mission becomes a deadly ambush, Chance finds himself at the mercy of an ancient conspiracy.

Pushed beyond his limits and unsure of who he can trust, Chance must race against an elusive foe to assemble the missing components to a ritual capable of unleashing something more powerful than Hell itself. With the fate of the world in balance, Chance finds himself in a game he can't win if he plays by the rules. Will he be able to fight this evil on its own terms and keep his soul intact? Or will he end up crossing a line even the Demon's Apprentice can't come back from?