From the Hugo and Nebula award-winning author of the science fiction masterpiece Dune, Frank Herbert's The Dragon in the Sea is a riveting thriller of a submarine crew trapped in the depths of the sea, hunted by one of their own. In the endless war between East and West, oil has become the ultimate prize. Nuclear-powered subtugs brave enemy waters to tap into hidden oil reserves beneath the East's continental shelf. But the last twenty missions have never returned. Have sleeper agents infiltrated the elite submarine service, or are the crews simply cracking under the pressure? Psychologist John Ramsay has gone undercover aboard a Hell Diver subtug. His mission is to covertly observe the remainder of the four-man crew—and find the traitor among them. Sabotage and suspicion soon plague the m