A DANGEROUS NEW ENEMY APPROACHES… Two decades after the events that nearly brought the Successor States to the brink of all-out war, the Great Houses exist in an uneasy peace. But now, from out beyond the Periphery comes a new threat. A swift-moving military force of unknown origin. Nothing the Inner Sphere has can stop them. Their power, speed, and ferocity are unparalleled. Some of the finest warriors and ablest units have challenged them and been crushed. No force has faced them and won. They are the Clans! A military juggernaut whose sole reason for existence is battle. A race that selectively breeds itself for combat. Humanity’s only hope is an alliance of mortal enemies. The Federated Commonwealth and the Draconis Combine, interstellar empires at war for 300 years, must now stand side-by-side—or face certain destruction.

THE ENEMY OF MY ENEMY... Since appearing in the Inner Sphere, the frenzied Clans have overwhelmed every planet they’ve invaded, brutally crushing any opposing force. Their race is selectively bred for combat. Their technology is superior to anything the Inner Sphere possesses. Nothing the Great Houses have can stop them. Humanity’s only hope—an alliance of mortal enemies—may be doomed. The Clan invaders have chosen their next objective—Luthien, capital of the Draconis Combine. House Kurita must now fight for survival on its homeworld. Hanse Davion is presented with a situation undreamt of...the final defeat of the Dragon itself. Should he attack his distracted foe and destroy the enemy his family has battled for over 300 years? Or should he reinforce a fellow House of the Inner Sphere against a force that Davion and the Federated Commonwealth might not otherwise defeat when their time comes? And even if the Houses should somehow agree to stand together against the Clan menace, another just as dangerous threat lurks within their very midst. ComStar, the semi-mystic sect that controls interstellar communication, schemes to hurl House Davion, House Kurita, and the Clans into a devastating war that will leave ComStar in a position to dominate the Inner Sphere...

The success of the Battletech TV series, comic books, and toys has led to a huge demand for the Battletech books. In this second book of the trilogy, the Clans have wreaked destruction across the Inner Sphere, forcing the Five Successor Houses to accept an uneasy alliance.

Succeeding in their invasion campaign with the secret aid of ComStar, the BattleTech warriors are unaware of ComStar's ulterior motive to reunite the Inner Sphere worlds under its single rule. Original.