Lost Fleet #1
a space captain is rescued from his escape pod 100 years after the battle he won. The alliance and the syndic are still at war. Through a variety of bad decisions on the alliance’s part, all their military leaders are butchered by the syndic, leaving John Geary in charge. His mission is to take the fleet home and deliver a hypernet key to the alliance. The current military is a bunch of amateurs and Geary must navigate politics as well as the enemy if he is to survive, much less succeed.
My cousin suggested this author to me and I’m really liking this series so far. Geary doesn’t want to be in charge, especially in charge of idiots. But he is and he does his duty.