Going to dolphin school under the sea is a magical experience for Pearl and her friends!

When Splash doesn't show up to dolphin school on time, Pearl, Echo, and Flip are worried. It's the season of the annual shark migration, and he could be in danger! Later, they learn he's hiding a big secret. He's made a new friend -- who's a shark!Everyone is shocked. But the shark is young, and lost from his family. Will Pearl and her friends defy the rules and help a scary creature home?