"The Great Houses of Kast'ar have grown complacent. Technological adaptation bolsters a fragile biosphere, but one quandary remains unattended. Lunar-based harvest vessels orbit continuously, extracting their toll of moisture from the upper atmosphere.
Over time, the planet dries.
Now the Rules are caught unawares when a lunar enclave launches an invasion intended to seize control of the Harvest. House Alar, the greatest of the bloodline Keeps, falls before the predatory warlord. The invader's technology is strong and they are aided by the Guild; wizard-like practitioners whose hallucinogen-induced evocations bend fate to their will.
It falls to Cairn, Legion pilot and displaced heir to Alar, to persuade the House Alliance to intercede. His father and his love Neilai are held hostage, and a battered Cairn is dispatched to carry the vile interloper's edict. With few resources at hand, Cairn and boisterous comrade Dirc Cutter are thrust into a changed world. The Alliance falters and Cairn, son of House Alar, learns how little he knows of his home world."