On a mission to find more ways that she can help the people of Arendelle, Anna befriends Mari, an adventurous young woman with a secret, while Elsa must deal with a mystery in Arendelle's western woods.

During a tribute to the late beloved King Agnarr and Queen Iduna of Arendelle, Elsa and Anna stumble upon some old boxes of their parents' belongings. What they find inside sparks some of their youngest childhood memories--it's a scavenger hunt created by their mother. Offering the sisters the chance to create a new experience with their mother, they enthusiastically begin the game. But to decipher the clues to the treasure, Elsa and Anna must look...