Elsa and Anna are great friends when very young, but an accident caused by Elsa's powers makes her cut herself off from her sister. Once their parents are killed in an accident, Anna's life becomes even more lonely and boring. When she meets Hans during Anna's coronation, she thinks she has found a way out of her boring existence, but Elsa is opposed to such a violent extent that she unleashes her powers of ice and freezes Arendelle. She runs away, and Anna takes off after her, leaving Hans in charge of the town. Eventually, she runs into Kristoff, who normally sells ice but whose business is thrown off by Elsa's sudden climate change. He reluctantly agrees to help Anna find her sister, but there are many obstacles in the way. When tragedy strikes, Hans turns out to be an untrustworthy character, and the solution lies in an unexpected corner.
This is strong action/adventure book and a good look at the difficult relationship that sisters have. I liked how Hans was painted rather sympathetically, since his older brothers and father were not particularly nice to him, and he did his best to run the kingdom, even though he didn't have the best motivations. For an adaptation of a movie for younger children, I thought this struck a good balance. Readers of Levine's Two Princesses of Bamarre and other fairy tale retellings will enjoy this.