When Elsa and Anna were children a terrible accident happened, injuring Anna. In an effort to protect Anna, her parents had an old troll named Grand Pabbie erase her memories of Elsa's magic. But now Anna feels like she is missing something because she can't remember anything about that time. When a young and eager troll named Brock promises to renew her memories, Anna is excited, but Elsa isn't sure that it is such a good idea. Will Anna's memories change the way that she thinks of her sister? Or can the two get past everything to make new memories?