A hired gun delivers frontier justice on a colony world in this exciting novel from "an imaginative writer with a director's eye" (Aaron Allston, New York Times-bestselling author of Mercy Kill: Star Wars Legends).   The man called Twelve is a hired gun, taking his laser pistol from planet to planet, renting his services out to the highest bidder. He finds himself on Glycon-Prime, a new colony at the edge of space. On the hunt for work, Twelve blows into a small frontier town--only to find a massacre. The survivors? A trio of young children, devastated by the murder of their families. They are hellbent on hiring the gunslinger to get revenge on the leader of the vicious mutants responsible--the man known only as The Serpent's Head . . .