First off, I love this series. Awesome action, political intrigue, fun characters and aliens, along with dry humor. Sten #4 goes back to more 'classic' military scifi where Sten joins the Imperial Navy and heads to the fringe territories. Gripping, and at times brutal.
Edit reread 12/20:
After saving the Eternal Emperor from an assassination attempt, Sten is 'rewarded' by the Emperor's advise to go into Naval pilot training. For the first third or so of the FOTD, we have Sten's mildly comical trek through basic training once again. He finally graduates and is assigned as a commander for a small fleet (four ships) of Tacships, short range small fighters (air/space) with crews of about 12 and sent to the capital of the 'fringe worlds', where tensions between the Empire and the Tahn are the highest. Sten is not warmly welcomed to the spit and polish ranks of the provincial capital, and worse, cannot find a way to staff/crew the ships.
Alex, the intrepid Scot, shows up and helps Sten find crew members, mostly from prisons and so forth. Then he proceeds to train the crews. This is your typical 'black sheep' squadron and it could be cliche, except for the again typical tongue and cheek presentation by the authors. The escapades are funny, but have a serious edge at the same time. After lots of preamble, the Tahn launch an all out offensive against the Empire, and one that is largely successful. Sten and his small fleet manage to survive, but the Tahn are closing in...
Once again, lots of action and humor. Alex keeps trying to tell a new joke (always bad) about a spotted snake. The Emperor manages to cook a large barbecue so we have a new recipe, and Sten once again proves to be an able leader. There is a lot of humanity in these novels, even if many of the characters are aliens, both on the positive and negative side. Perhaps this, plus the gritty universe created here, is what makes these novels seem so fresh rather than dated. This one ends on a cliff hanger with the Empire and the Tahn locking horns in a war to end all wars. 4 stars!