Many years after the tales in Hogwarts we know have come to pass, new characters enter the stage. Merida, Hiccup and Rapunzel cross paths, the three becoming quick friends. But then, in their fifth year, a strange boy comes to Hogwarts from Durmstrang Institute of Wizardy in Bulgaria, by the name of Jack Frost. And strange goings on start happening in the castle...

Political marriages are nothing new. Times are hard even in the harsh Northlands, with dragons and marauders in abundance and allies few and far between. But when Hiccup and Merida are forced together to forge an alliance between Berk and the Highlands, will the result be heartbreak or will unexpected feelings defeat an ancient evil that threatens to turn the world to ash?

The day before Hiccup's final dragon training test, Astrid never finds him in the woods. He suits up, packs up, and heads for the sky. Across the ocean, princess Merida runs away, wishing for anything in the world to change her fate. A hop, a skip, and a boat ride away, Rapunzel with her magic hair just can't wait to be finally free.