When Hiccup, Jack Frost, Merida, and Rapunzel meet for the first time in detention at Hogwarts, the rivalry between their houses leads Jack and Merida to turn against each other. The four struggle to find their true friendships, and things take a dark turn as Voldemort's influence on the wizarding world expands. The Big Four discover the wonder of magic, but also the evil dangers.

Loki is broken out of prison a second time and assists in plan to gain Thor and Jane's souls. Tracking them on Earth, he meets people who make him question where his loyalties lie. Hope, loss, and sacrifice shape Loki into something that could be loved. Wherever Loki goes, however, betrayal is never far behind. For the God of Lies and Mischief, sadness and disaster never rests.

After becoming a guardian Jack feels lonelier than ever. Now that he has friends he never sees, Jack realizes how solitary his life will be. He seeks an unlikely acquaintance to help conquer his growing fear and his growing affection towards the Tooth Fairy. Little does Jack know that he is about to meddle in forces beyond himself, and he will soon learn how it feels to be burned.