Humanity's interstellar Commonwealth is in serious trouble. Thirteen of its hundreds of worlds (linked by wormholes and high-speed trains) were lost to a first mass attack by the insanely hostile alien Primes. The controlling Prime intelligence, MorningLightMountain, can imagine no way of dealing with first contact but genocide - and has the resources to do it.

Amid political and personal chaos, it's becoming clear that the war was arranged by a third party. For centuries, only the fanatical, outlawed Guardians cult believed in this mysterious influence called the Starflyer. New evidence emerges, only to vanish again. Key figures are destroyed by near-invincible assassins crammed with inbuilt "wetwired" weaponry. One determined detective is on the track, but she faces massive political opposition.

The multi-stranded action follows many criss-crossing human stories, with fights, pursuits, quests, deaths, resurrections, exotic landscapes and armaments, good sex, and several interesting aliens. Betrayals are frequent, thanks to brainwashed Starflyer agents in positions of trust. Only the Guardians have a scheme to deal with the Starflyer itself - a grandiose strategy known as "the planet's revenge" - but no one trusts those crazy cultists…

In space, the arms race becomes dizzying, with Prime doomsday weapons used against suns while frantic human research leads to "quantumbusters" so appalling that there's serious moral debate about their use. Can we face the guilt of total genocide, even against a horror like MorningLightMountain? Or is there some way to force this psychopathic genie back into the bottle?