On the moon, Kate Devana is the law. Kate Devana reluctantly took a job as the chief of security for the Lunar Colony, a department of one. She's on her own, an eight-hour rocket ride from the nearest Earth police station, trying to keep drunk uber-rich celebrities from killing each other. Her only backup will come to investigate political enemies, if they come at all. A Marine and a Guardian, she's trained to fight behind enemy lines while outnumbered in space. But wrangling fat cats isn't what she expected, and she finds herself scrambling to keep the place from becoming the new Wild West. Then anti-technology terrorists calling themselves the Orionids knife a wedding guest and set off a devastating bomb, and Kate must find a way to stop them before they destroy the entire colony.