Ty has always known that the ocean is a dangerous place. Every time he swims beyond the borders of his family's subsea farm, he's prepared to face all manner of aquatic predators, including sharks, squid, and killer whales. What Ty isn't prepared to find in the deep is an entire township chained to a sunken submarine, its inhabitants condemned to an icy underwater grave. It's only the first clue to a mystery that has claimed hundreds of lives and stands to claim two more — lives very precious to Ty and his Topsider ally, Gemma. Now in a desperate race against the clock, Ty and Gemma find themselves in conflict with outlaws, Seaguard officers, and the savage, trident-wielding surfs, plus a menagerie of the most deadly creatures the ocean has to offer. Kat Falls brings to life the mysteries, marvels, and monsters of the deep in this fast-paced and inventive action-adventure.