BattleTech Universe Series / Operation Excalibur / William H. Keith, Jr.

The Gray Death Legion detaches themselves from the planet Glengarry, and takes service with their erstwhile enemy, the rebellious governor of Hesperus. Under the guise of turncoats, they play a dangerous game of brinkmanship that culminates in a battle among the ‘Mech factory itself. Can they bring Hesperus back into the Lyran Alliance, or will they destroy the factory they swore to protect?