Aisha wants to concentrate on her music while her unicorn Silver wants to play, but the two must work together to expose the villain causing dangerous hailstorms and other extreme weather disasters at Unicorn Academy.

"Phoebe and her unicorn, Shimmer, are always looking for excitement and adventure! But when an inspector visits Unicorn Academy, everything at school must seem as calm as possible. Then, on a field trip to the beach, some surprise weather puts the whole class in danger. Can Phoebe and Shimmer save everyone on the beach and keep the inspector happy?" --