Spoilers ahead.
Edit: I ended up finishing the book and changed my rating to 4 stars from 1 (actually 3.5 stars but maths tells me 0.5 always rounds up). So what changed my mind?
For one thing, the writing was easy to read and flowed well. I followed along the mission and it was all action from there. There were no slow parts. Sure, you have to suspend belief on some of the action but that's ok, I already knew that. After I got over that, it was just natural to keep reading.
There's no guile in the book, not much, actually not any deep thought. The mission itself was kind of an after thought to all the shooting. It was like a comic book or action movie, but just in a book. People shot and killed each other with abandon, tanks got blown up comic book style, tactics were dumb, good guys lived and bad guys died. And it was a very quick read, I finished it in a couple of hours after I put it down the first time.
I gave it 3.5 stars because it was a good bit of comic action and I enjoyed it. I probably won't continue on the series but it was a good couple of hours reading.
------------ Old review below:
1 star = I did not like it by GR's rating system. Spoilers ahead.
Sorry but I had to dnf this because the tactics were so unrealistic. I came to the part of the book where the Germans are sending reinforcements to a mining operation deep in Finland. They send a Tiger II, 3 Hanomags and 2 trucks. First of all, I would not send a single Tiger. It's a heavy tank, to be used against other tanks. Logistics being what it was, it would be a nightmare getting a single Tiger there. I would just send a PaK gun or two and Panzerfausts; a mobile tank would not be needed to defend, you'd probably have to entrench it anyway in a defensive position.
Secondly the lieutenant in the Tiger was supposed to be commanding the detachment, and assuredly he would not be - he's just a tank commander. Furthermore the German convoy didn't have a scout in front. And lastly the Hanomags went after guys on skis in the woods, which is patently impossible. I had to stop reading after that part.
Apart from all that, the premise was ok. The Brits send a small party of men to destroy a mining operation in Finland where they have to fight the Germans and maybe the Finns and Russians. The other thing I didn't like were the different POVs, though this is probably the one time it would be ok. But the writing, and the character buildup and depiction were a bit amateurish. I just didn't want to spend any more time on it.