Ciudad de Cielo is the 'city in the sky', a space station where hundreds of scientists and engineers work in Earth's orbit, building the colony ship that will one day take humanity to the stars. When a mutilated body is found on the CdC, the eyes of the world are watching. Top-of-the-class investigator Alice Blake is sent from Earth 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.