Colonized and left to its own devices, the planet on which Lehnik the horsemaster lives has, over a thousand years, reached a medieval level. Sent with an orphaned child to the hold of the Sisters of Silence, the soldier learns that their order exists to guard the very sophisticated -- and perilous -- weapons left to them by their Terran ancestors.

When Garrouche invades Trans-Kell, after its ruler has overcome the Order in his own country and stolen its weapons, Lehnik joins the Order in Trans-Kell. and undertakes a hazardous journey to find and destroy the devices that could wreak havoc on their world.