Descent - Marko Kloos

A nationalist uprising triggers an interstellar wrest for control in an epic novel of embattled worlds by the author of Citadel and the Frontlines series. POW Aden Jansen has lost a decade of his life to both the war and internment when he's recruited by the Alliance. He's to return to Gretia as an undercover Blackguard operative and destroy Odin's Wolves—an insurgency that's setting his home world afire. The mission comes with a full pardon and a chance to reclaim his identity. It also means rejoining his friends and family in space. That's motive enough. If he can succeed—and survive.
Dunstan Park is on piracy patrol to track down the spaceborne arm of the uprising. Meanwhile, the rebels' insidious terrorist cells are targets for battle-hardened insurgent hunter Idina Chaudhary and her Palladian commandos. As for Aden's sister, Solveig, she's put herself in the line of fire before, but discovering who's bankrolling Odin's Wolves is as dangerous as it is personal.
As Aden works his way back into the confidence of his comrades, the stealth campaign to sow discontent descends into chaos. At risk: Aden's legacy, and the very stability of a galaxy struggling for peace against all odds.