Queen Anna of Arendelle has been preparing for the Polar Nights celebration that is held every year to welcome the days when the sun doesn’t rise in the polar circle. Joined by Kristoff, Sven and Olaf, Anna reunites with Elsa in the Enchanted Forest.

After a night of spooky stories around the campfire, Olaf swears that one of the creatures from their tales has come to life! Who else could be responsible for the sudden onset of storms and the earlier-than-normal darkening of the skies? Why else is everyone starting to become so forgetful? Anna and Elsa join forces to determine what is going on. Together they recall Kristoff’s terrifying tale about a princess who turned into a draugr—an undead creature that steals memories to make others forget the misdeeds it committed when it was alive.

Is it possible that Kristoff inadvertently unearthed memories of a draugr and thus unleashed the monster upon Arendelle? Anna and Elsa must uncover the real story behind the tale before everyone in Arendelle forgets who they are and their world is cast into darkness forever ...