Elsa, Kristoff and Olaf are getting ready to celebrate Anna's birthday, but will everything go as planned? Find out in this Frozen Fever picture book. It's Anna's birthday and Elsa is planning the best day ever for her younger sister. There will be music, cake and lots of special gifts. But on the day itself, Elsa isn't feeling too well. Her sneezes are having a strange effect on her icy powers and creating little bundles of snowy trouble! Can Kristoff and Olaf help to keep things under control? Find out in this magical tale of Frozen Fever.