Book one of the Europa series.
 
NASA is preparing to launch a manned mission to Europa—but it never leaves. Chief Engineer Luka Janovic is on the run in the occult obsessed slums of Low City. A private space company hunts him, hoping to usurp control of the mission and its antimatter fuel. A crewmember warns him of their plan and promises asylum with an unknown militia, but this new ally may not be the salvation he seeks.