Jack Campbell 
Lost Fleet : Beyond the Frontier – Guardian 

EMPIRE IN REVOLT Admiral Geary’s First Fleet of the Alliance has survived the journey deep into unexplored interstellar space, a voyage that led to the discovery of a new enemy and a possible ally. Now Geary’s mission is to ensure the safety of the Midway Star System, which has revolted against the Syndicate Worlds empire-an empire on the brink of collapse. As Geary endeavours to escort the fleet home unharmed, the Syndics’ attempts to spread dissent and political unrest may have already sown the seeds of the Alliance’s destruction… Praise for Jack Campbell’s The Lost Fleet series: "Absorbing… Neither series addicts nor newcomers will be disappointed."-Kirkus Reviews "Fascinating stuff… this is military SF where the military and SF parts are both done right."- SFX Magazine