Lethal Heritage (Blood of Kerensky Trilogy, #1)

The year is 3030. For the past 300 years, since the Star League collapse and the rise of the Five Successor States, these mortal enemies have fought over space, land, and politics. But a new threat looms just outside the Inner Sphere. The descendants of an old Star League general, the Clans, bred to be the best military force humanity has ever seen, have come to take what they believe is rightfully theirs.