Action-packed, interesting characters, and a well-thought out plot make Pierce Brown's debut novel a winner. Darrow is the main character in this sci-fi thriller. He is a hell digger and a "red", the lowest-class human. He, and other reds, live beneath the surface of Mars where they work in the mines to prepare the surface of the planet for human habitation. What Darrow and the other reds don't know is that the surface of Mars is suitable for life. In fact, humans have been living on the surface of Mars for over a hundred years.