A year ago, Klara's mother died, leaving three children with their haggard, busy father. For Christmas this year, Klara and her siblings travel to stay with their mother's parents. Klara expects this to be the typical Christmas stay, with trees, Christmas shopping, and gifts, but on the night of her arrival, she is taken to a mysterious, fantastical world to help save a kingdom from the cruel Rat that took it over and enslaved the people.