***The first book in the incredible New York Times bestselling series*** Darrow is a Helldiver. A pioneer of Mars. Born to slave beneath the earth so that one day, future generations might live above it. He is a Red - humankind's lowest caste. But he has something the Golds - the ruthless ruling class - will never understand. He has a wife he worships, a family who give him strength. He has love. And when they take that from him, all that remains is revenge . . .