Vigilante — Laura E. Reeve

Amidst an uneasy peace between the Autonomists and the Terrans, Major Ariane Kedros and her partner, Matthew Journey, have discovered alien ruins on a remote planet-ruins that bear evidence to an ancient and highly advanced technology. But their discovery has drawn the interest of high stakes players from every corner of the universe-including that of the rogue leader of a fringe Terran sect. Ari must find a way to stop him, before they all become ancient history...