|Publisher||Victor Gollancz Ltd|
|17 May 2007|
|Media type||Print (Hardcover & Paperback)|
|Pages||560 pp (Hardcover)|
|ISBN||0-575-07513-9 (UK Hardcover)|
ISBN 0-575-07813-8 (UK Paperback)
ISBN 0-345-48525-4 (US Hardcover)
Carl Marsalis is a selectively bred human ("genetic variant") known as a "Thirteen", characterized by high aggression and low sociability. Bred to serve in a military capacity, Thirteens were later confined on reservations or exiled to Mars. Carl, having won by lottery the right to return from Mars, works covertly, tracking down renegade Thirteens.