The Ragnarok Saga Books in Order

Thomas Stein's first command is attacked by space pirates whose operations extend far beyond one ship. His estranged father, Admiral Nicholas Stein, has prepared for the threat, but stopping it requires confronting an enemy seeking control of humanity.

Earth's dependence on Martian energy makes conflict with an independent Mars increasingly likely. Admiral Nicholas Stein prepares his planet's defenses while his son Thomas investigates Earth's fleet, becoming entangled in political maneuvering as war begins.

Earth's new weapon and a surprise attack shatter the fragile peace with Mars. Thomas and Nicholas Stein fight back as armored marines battle on Venus, while their enemy's hidden ambitions threaten the future of the entire solar system.

An alien ship escapes Earth's defenses and rebuilds the gate needed to summon an invasion fleet. Ghost Squadron and the Intrepid must confront the arriving force, with humanity's available weapons offering little more than a chance to delay it.

Samantha's uploaded consciousness is recalled from Valhalla Online for a military mission near Neptune. Digital minds can survive acceleration that would kill human crews, but stopping the alien construction requires risking permanent death beyond the game's safeguards.

Jasper Stein breaks the rules to help a friend on Mars, confident that his space experience will keep him safe. An accident leaves him injured and isolated, searching for one remaining chance before the planet's night becomes fatal.