Lost Destiny — Michael A. Stackpole

THEY HAVE CONQUERED
The Clan invaders are driving toward their ultimate objective--Terra, cradle of humankind and hub of the ComStar communications network.

NOTHING WE HAVE CAN STOP THEM
The heir to the throne of the Draconis Combine is missing. Whole regiments of BattleMechs lie smashed like abandoned toys. Rasalhague is overrun. The Clans are sweeping toward the center of the inner Sphere in a relentless tide.

THE CLANS
Invaders from beyond the Periphery, the Clans have beaten the forces of the inner Sphere repeatedly. Warriors bred for battle and mated to fantastic war machines, Clansmen live for victory and pray for death before defeat.

HUMANITY'S ONLY HOPE IS THE INNER SPHERE'S MOST POWERFUL TRAITOR
ComStar betrayed the inner Sphere by aiding the Clans in their conquests. Now the mystic sect that controls all interstellar communication must face the Clan hordes alone. The untested warriors of ComStar are the Inner Sphere's last defense against total defeat.