Former British military diver Holden Cameron must investigate the suspicious activity surrounding a Donnelly dive to recover treasure from the ancient wreck of a pirate ship located near St. Vincent. When equipment, treasure, and even divers begin to disappear, owner Kate Donnelly and Holden form an uneasy alliance to uncover the truth. But the deeper they plummet into the mystery, the closer they come to each other. Soon they are sharing their deepest...

On a top-secret dive into the Pacific Ocean's deepest canyon, Jonas Taylor found himself face-to-face with the largest and most ferocious predator in the history of the animal kingdom. The sole survivor of the mission, Taylor is haunted by what he's sure he saw but still can't prove exists-Carcharodon megalodon, the massive mother of the great white shark. The average prehistoric Meg weighs in at twenty tons and could tear apart a Tyrannosaurus rex...

When Dorothy Ann accidentally loses Jyoti's high-tech locket in the ocean, Ms. Frizzle's class travels down through the layers of the sea to retrieve it. Includes glossary.