In a hidden alcove within Chicago's Art Institute, Max McDaniels discovers a faded tapestry. As he watches, the tapestry begins to glow; soon after, he receives an invitation to attend a private boarding school in New England. When he arrives at Rowan Academy, where young people with Potential are trained to fight an unnamed enemy, he and the other apprentices are housed in magically morphing rooms and assigned animal charges. Max is paired with the last lymrill in the world, a nocturnal creature with metallic quills. They train on the Course, where they experience different scenarios as they try to achieve a goal and move up levels as they progress. Meanwhile, apprentices and even some full-fledged agents are disappearing all over the world.