"This is as close to a city without crime as mankind has ever seen." There has never been a homicide on Ciudad de Cielo. It's the 'city in the sky', where hundreds of scientists and engineers live and work in earth's orbit, building the colony ship that will one day take humanity to the stars. When the mutilated body of a common criminal is found on CdC the eyes of the world are watching - multiple governments and corporations have a stake in catching humanity's first spacebound killer. Top-of the-class Detective Blake is sent to team up with CdC's Freeman - a jaded cop with no interest in working with a rookie from Earth. But the mismatched duo must learn to cooperate quickly, before they become the killer's next victims...