The Secret Library: Olaf and the Tale of Miss Nettle.Sofia is summoned by the secret library and The Tale of Miss Nettle is selected, revealing that Sofia's old enemy is taking the prized snowdrops from Hildegard's kingdom of Freezenburg, which will ruin the Winter Flower Festival. While trying to stop Miss Nettle, Sofia is sprayed with the fairy's Crazy Crystals, which causes her amulet to go awry: she can no longer understand animals by translation, and instead of a princess, Olaf the snowman is summoned to help her resolve things. Note: After the amulet to go awry, Anna and Elsa are mentioned.