The Lost Stars - Imperfect Sword (Book 3) - Jack Campbell

President Gwen Iceni and General Artur Drakon successfully liberated the Midway Star System - from Syndicate rule, but the regime won't surrender without a fight. Their former leaders have ordered the rebels terminated with extreme prejudice and the system's citizens punished for their defiance. Outnumbered, Midway's warships are no match for the fleet preparing to strike. But the Syndicate isn't the only threat facing Iceni and Drakon. A former ally has taken control of the Ulindi Star System, the first calculated move toward establishing his own empire. As Midway erupts in violence, Iceni and Drakon face a renewed revolt, leaving them vulnerable to trusted officers just waiting for an opportunity to betray them...