Anna of Arendelle wants nothing more than to be helpful to her older sister, Elsa. But as far as Anna can see, ever since Elsa's coronation, her sister has been doing just fine without her. And now, Elsa will be setting sail for a grand tour of the world--leaving Anna behind. But a mysterious sickness strikes Arendelle, and Elsa's tour is delayed, giving Anna the perfect opportunity to finally help.

When Anna discovers a secret room in the castle and incants a magic spell, she hopes it will make her dream of curing the sickness come true. Instead, a more sinister dream comes to life. This thrilling original middle grade novel bridges the epic adventures of Frozen and Frozen 2.