When Rachel, Kirsty, Gracie and Khadijah go on a water sports school trip, they are excited to go diving. But Naughty Jack Frost and his mischievous goblins are determined to ruin all the fun and have stolen Keiko the Diving Fairy's magical flip-flops! Now the divers don't have the confidence to dive. Can the fairy helpers find the flip-flops so everyone can enjoy diving again?