One mistake. One mistake puts everything Mark Fischbach cares about in danger. In a moment of desperation and foolishness, Mark makes a deal with a supernatural being. Believing that this entity will help him, he deems it to be trustworthy. But he soon realizes he couldn't have been more wrong. Now Mark has to find a way to fix his mistake, before he and his friends become pawns in a game that's not theirs to play.