Jack Geary and his lost fleet are getting closer to the alliance border. The Syndic has pulled their reserve fleet from the far border (the one towards the alien threat) and now it is hunting Jack.
The fleet liberate an Alliance prison camp, the fleet suffers sabotages while they have to struggle with the big picture threat from the aliens blowing up hyper gates.
John also has to handle the backside of his popularity as a fraction tries to get him to stage a coup when they return to Alliance space.
I think the first part of this series is close to it’s end. The next part will probably be the start of the alien cycle. Solid military Science Fiction but not exceptional.