A fun adventure that helps fill in the lore behind the game.
I do have one major complaint with the book though. In one scene, one of the characters tortures a member of the main villain's crew for information. Now I don't necessarily take issue with the depiction of torture in fiction in general. I realize that it's a thing that happens, especially given that this is a medieval setting. What disappointed me is that the torture in this scene results in good information, when we know now that torture is extremely unreliable as a method of obtaining accurate intelligence. A portrayal like this simply feeds into the misguided notion that torture is justified because of the important information that it provides, which simply isn't true. This feels very irresponsible at a time when many people are, horrifyingly, arguing in support of the use of torture.
Still, that's only a small part of the book, and the rest is pretty good. So if you can look past the politics of interrogation techniques, it's a decent addition to the Banner Saga story.