On a top-secret dive into the Pacific Ocean's deepest canyon, Jonas Taylor found himself face-to-face with terror. The sole survivor of the mission, Taylor remains haunted years later by what he saw. Written off as a crackpot, he insists that the prehistoric shark known as Carcharodon megalodon still swims the deep underwater chasms. Only an urgent call for help from one of his oldest friends can persuade him to return to those deadly waters. Now Taylor will relive his darkest nightmare, only to find that what he saw before was only the beginning. For what lies deep beneath the waves is a horror that could turn the tides blood-red until the end of time....