Space Ranger Captain Jethro (Jett) Rogers is on the trail of gangster and smuggler Frankie Malone. Just when Jett discovers that Frankie is involved in a plot to illegally distribute war-fighting robots on the black market, his supervisor reassigns him to another, more sinister case. Three Space Rangers have been brutally assassinated near the Martian sector.

Jett's job is to discover who is responsible and bring them to justice. Lightning-fast with a laser pistol, this no-frills Ranger, who prefers to work alone, is saddled with an extra burden, on this, his most dangerous case. A young female Ranger, fresh out of the academy, Betty Warren, is ordered to accompany her new partner to the ends of the solar system and back.

Together they discover that the two cases are inextricably connected.