Lily and Jess came to the Forest of Friendship to take part in the Sandcastle Tournament on Sapphire Island. But suddenly it became sharply colder, the lake was covered with a crust of ice, and instead of summer, winter reigned. The girls are sure that this is all the machinations of the evil witch Griselda. They have very little time - before all the inhabitants and guests of the island catch a cold, Lily and Jess need to figure out what happened and how to fix everything!