The lost fleet - Jack Campbell

Legendary war hero Captain "Black Jack" Geary fights to stay
ahead of his enemies in the fourth novel in Jack Campbell's New York Times bestselling military
science fiction series.

Deep within Syndicate World space, the Alliance fleet continues its
dangerous journey home under the command of Captain John "Black Jack"
Geary-revived after a century spent in suspended animation. Geary's victories
over the enemy have earned both the respect-and the envy-of his fellow
officers...

Geary has made many risky decisions as commander of the Alliance fleet, but
ordering them back to the Lakota Star System where the Syndics nearly
destroyed them has his officers questioning his sanity. It's a desperate
gamble that may buy the fleet just enough time to prepare for the Syndics'
inevitable return.

Even as he struggles to give the fleet a fighting chance at survival, Geary
faces dissent from within. An unknown number of officers want a change of
command, but Geary knows that the Alliance fleet must stand together, or else
the Syndic forces will tear them apart...