Well, I am on a roll with reading books wrong. In the case of Diana Gabaldon's Voyager, the third book in the Outlander series, it's because I got it out of the library, only read 25% of it before I had to return it about two months ago, got back in line, and read the rest of it last week when it finally cycled back to me.
While Outlander took place almost entirely in Scotland, and Dragonfly in Amber brought us as far as France, the aptly named Voyager brings us basically everywhere. Acting on news from the research project she, Brianna, and Roger started in 1968, Claire moves from Boston back to Scotland, travels back through the stone circles at Craigh na Dun to sometime in the 1760s, tracks down Jamie in Edinburgh, and from there a relentless flood of shenanigans takes them all around Scotland, then to France, and then back over the Atlantic to the Caribbean. And that's just the main plotline, from Claire's perspective. We also get POVs from Jamie, as he does all sorts of dramatic Highlander things like hide in a cave for seven years and escape from an English prison; from Roger; and from one Lord John Grey, who seems to have a bunch of his own spinoff novels now.
The book is also kind of all over the place in other ways, too. Some of it is very serious--Jamie's time in Ardsmuir, for example, is pretty dark, treated with all seriousness and mostly not filled with highly improbable action-hero hijinks. Other bits are, uh, not--once they get on a boat everything basically becomes "Highlanders of the Caribbean" and it's all very colorful and almost absurdly action-packed, and develops a serious case of Les Mis-level small world syndrome (you know how in Les Mis, Paris has like twenty people and one policeman and one apartment to rent? In Voyager, the entire British Empire has about twenty people, one ship, and two military officers).
One of the big effects of leaving the rural Scottish highlands is that there are a lot more people of color in this book, which is a thing that can obviously go very wrong very quickly, especially considering the time period is really the height of British colonial power in the New World (it's like, 10 years before the American Revolution starts, I think) and the slave trade is in full swing. I have... mixed feelings about how this is handled. It's clearly well researched, which certainly helps it avoid some of the more common myths and pitfalls about the time (most notably, Gabaldon knows what involuntary indenture is and the ways in which it is similar to and different from chattel slavery; this shouldn't be noteworthy but it is). But the general approach she takes to characterizing pretty much all ethnicities--which is not so much to avoid stereotypes, but to deliberately walk straight into them and then try to build up more perspective/characterization on top of it--works slightly less well with, for example, the one Chinese character--a short, frequently drunk man with very bad English whose skillset is basically a grab bag of Chinese Things, including Chinese herbal medicine, acrobatics, calligraphy, acupuncture, and, of course, magic--than it does with any one of the ten billion Scots that populate the series. (Granted, one of the things I do kind of like about the books is that every culture the characters come into contact with has its own magical traditions and they all appear to work equally well, but the execution can still feel a bit clumsy--like, this random English lady keeps finding herself in situations where every time she meets new people she gets to witness their magic in action. Every single time.) The one Chinese dude is an especially interesting case of both being an interesting character and giving me wincy feelings because he's a fairly major secondary character and he gets a good amount of page time. He's known throughout the book as Mr. Willoughby, which is obviously not his name but was bestowed upon him in a well-meaning but ultimately worse-than-useless attempt to help him blend in. He's sometimes a comic character but other times a very tragic one, especially when you finally learn his backstory--something I found particularly interesting was that a major part of his backstory is that he is actually kind of a sexist dillweed, in the hopeless-romantic-with-ludicrously-unrealistic-views-of-women method that made me like him a bit less as a reader but is clearly a huge point of commonality between him and a lot of the white dudes in the book. By the end of the story I actually did like him, but there were a couple of cringeworthy scenes to get to that point.
Also cringeworthy is an appearance of one of my least favorite tropes EVER, actually I don't really know if it's a trope but I have seen it in one other book at least, which makes two too many--where a nice white lady who is very opposed to slavery gets so upset about it that she winds up owning one, because that is totally a thing that happens, and it is very upsetting, because clearly the important thing about slavery is how hard it would be on anti-slavery white people to be landed with one, and now she has to decide how best to go about being a good white savior, which in both cases I've read have inexplicably involved steps other than "ask person what they want and do it." I partly don't like this trope because it smacks very strongly of "author's personal self-examination and thought exercises leaking onto the paper"; in this case, many of the compounding issues that cropped up in the Jackie Faber book where this happens are thankfully avoided, but at least in the series so far, I can't help but think that the entire subplot with Temeraire could have been completely excised with no harm done to the rest of the book whatsoever.
These are the low points. There are many, many other things going on in this book (these books tend to be pretty densely packed with a wide assortment of Things), including the reappearance of Geillis Duncan (who is a major creeper), our first gay character who isn't predatory and terrible, hints of family backstory and things for Claire's Boston doctor friend Joe Abernathy (JOE ABERNATHY IS GREAT), lots of ladies with lots of agency in different ways all along the moral spectrum, and, as usual, a lot of sex, although kilts have been sadly outlawed at this point so Jamie is reduced to constantly wearing breeches. And have I mentioned the MELODRAMATIC ADVENTURES ON THE HIGH SEAS? It is everything you could want out of a melodramatic adventure on the high seas; I think Gabaldon had a checklist of Stuff That Happens When Adventure On the High Seas and made sure every point got in there somewhere--there is kidnapping, espionage, shipwrecks, slave revolts, an outbreak of plague, naval battles, pirate attacks, smuggling, big storms, seasickness, hardtack with weevils, a Portuguese pirate with too much jewelry and a cutlass, stowaways, a parentally disapproved-of romance, and even a dude with a hook for a hand, although the said dude is Fergus, who we actually met in the last book and who lost his hand long before becoming a sailor. At one point there is even a big hat. (Note: People for whom melodramatic pirate adventures are NOT catnip might find this half of the book frustrating, the way I find cartoon physics in non-cartoon movies frustrating, because it kind of pushes against one's suspension of disbelief sometimes. I'm just willing to overlook this because for me, melodramatic pirate adventures are SUPER CATNIP.)
On a more serious note, the looks we get into the British penal and colonial systems, in Scotland and elsewhere, are really, really well done, I think--they're very informative but also very emotionally engaging, and involve a lot of heavy stuff about power and identity, which is especially apt since the British relied even more heavily on eradicating people's identity to conquer them than they did on brute force (not like brute force wasn't a major component, of course). I particularly appreciate the looks at the basically decent English people who were still complicit in and perpetrators of these colonial systems that very definitely weren't at all about "helping" or "civilizing" any of the people in the lands the British took over and who the English definitely never saw as their fellow countrymen, even the sort of nice ones, no matter what the official imperialist rhetoric was.
This book's story arc never particularly wraps up--it just leads right into the next book, which I have dutifully added to my library queue. The line is shorter than it was for the last few books, so with luck I will have it within a few weeks.