As the novel begins, the Hansa's test of a recently discovered ancient Klikiss technology that can convert gas giant planets into suns is a success. The ignition of the planet Oncier will eventually make its satellite moons into habitable worlds perfect for human colonization, but it has also murdered millions of hydrogues, a previously-unknown race of gas elementals living in the high-pressure core of the planet. Confined in crystalline globe ships, the hydrogues retaliate by systematically destroying several Roamer skymines, floating factories which harvest the hydrogen used to produce the vital stardrive fuel ekti from the atmosphere of gas giants. The powerful warglobes also destroy the moons of Oncier and the scientific space station there before warning the human race to stay away from all gas giants or be destroyed. This ultimatum is punctuated by the murder of the Hansa's puppet king Frederick and everyone in his vicinity.