Polar nights

Queen Anna of Arendelle is busy preparing for the Polar Nights celebration that is held every year when the sun doesn't rise in the polar circle. To relax, Kristoff suggests she go visit her sister Elsa, the Snow Queen, and they spend an evening sharing spooky stories around a campfire in the Enchanted Forest. Kristoff tells them a story about a princess who turned into a draugr, an undead creature that steals memories to make others forget the misdeeds its committed when it was alive. Soon, strange things begin to happen in Arendelle, and Anna and Elsa fear that Kristoff's story inadvertently released the monster on Arendelle. The sisters must work together to uncover the truth about the story in order to save their home.