It's the day of the Great Treasure Hunt and everyone is joining in!

Coral is excited to lead her team of best friends to the treasure first. But soon they discover that there is a bigger mystery to solve...

Who is the mer-sterious Count Frumplesquid, and what does he really want in Cockleshell Cove?

Can Coral and her crew work together to uncover the truth and keep the precious treasure safe?