Arriving in Sri Lanka to find an extremely rare Pondicherry shark, 12-year-old Adrianna Villalobos and her family discover that it is the main attraction in a restaurant aquarium and must convince the restaurant's owners to release it back into the wild.

"Razi, a local fisherboy, is watching turtle eggs hatch when he sees a boat bobbing into view. With a chill, he notices a small, still hand hanging over the side. Inside is Zheng, who's escaped a shipwreck and is full of tales of sea monsters and missing treasure. But the villains who are after Zheng are soon after Razi and his sister, Shifa, too! And so begins an exhilarating escapade in the shadow of the biggest sea monster of them all"--