Anna, Elsa, Kristoff and Olaf with Sven help the little troll Kaminek get a tracking crystal so that he can participate in the most important event of the troll year - the Festival of Crystals. So they embark on a dangerous journey, at the end of which a magical spectacle awaits them, the magical aurora borealis. Everything they experienced on the adventure trip, they personally wrote down and drew in this travel diary. Even Olaf and Sven helped with the notes. And because they captured a lot of knowledge about nature and troll customs in the journal, the travel journal will become a permanent part of the royal library in Arendelle so that everyone can learn about troll wisdom