Have you ever had a wish come true? When Andi and her sisters go on a trip to the beach, something magical happens. Andi sets out on an enchanting underwater adventure to scour the ocean in search of the prettiest shell in the sea. Along the way, she meets some new sea friends who help her on her quest. Andi spends all day searching and when all hope of finding her shell seems lost, an unexpected gift from an old friend might be just what she's looking for. Will Andi be able to succeed and show her sisters the prettiest shell in the sea, or will she return to the beach empty-handed?