The Alexander Inheritance is technically a part of Eric Flint's Ring of Fire series begun with 1632. In the multiverse of the Ring of Fire (or Assiti Shards as it is sometimes called, though that name has kind of fallen out of use), an advanced alien species, the Assiti, practice an art-form of sorts involving quantum strings in deep space. By Providence or dumb-luck the detritus of one of their art displays impacted Earth in the year 2000, sending the environs of Grantville, West Virginia back to Germany in the midst of the Thirty Years War and spinning off an alternate universe in the process, leading to the events that are described in the 1632 series, as the Americans kick-start the rise of democracy 150 years early. Later, a second shard impacts a prison in Alexandria, Illinois (which is confusing given the title of this book), sending the inmates and guards back to prehistoric times, which was the subject of the book Time Spike, which was probably supposed to be the start of a second series, but it didn't really draw in the RoF fandom (also, amusingly, I seem to remember that early on in the Ring of Fire series, Flint was apparently working on a story where George Washington and Frederick the Great ended up getting thrown back to Greco-Roman times). Full disclosure, I haven't read Time Spike (reviews aren't that positive and I don't remember that my library ever had a copy (UPDATE (4/23/18): okay, so now I actually have read it, not that it's anything to boast about, but there it is). Anyway, the Alexander Inheritance begins in pretty much the modern day. A third shard impacts in the Bahamas and conveys a cruise ship, its tender-tug and a bit of dock back to the late 4th century B.C. (I refuse to use the ridiculous C.E./B.C.E. notation, so there), right after the death of Alexander the Great. The international crew and (mostly American) passengers of the Norwegian cruise ship Queen of the Seas are thereafter confronted by a world that's tearing itself to pieces as without Alexander's charisma and military acumen to hold everyone together, his generals and family are all out to carve themselves a slice of his Empire.
What I liked: I thought the authors did an excellent job of contemplating how a cruise ship and its crew/passengers would impact the world of 320(ish) B.C., the ship is pretty much invulnerable at sea due to its speed, construction, and sheer bulk, but it is in constant need of things it can't get on its own, forcing them to trade and seek good relations with anybody they can. In turn, the knowledge the ship and its people (I refer to them as the New Americans, since that's what the majority end up calling themselves, but ship-people would be more accurate) provide can transform the Hellistic world, but there is a crazy-wide culture gap that makes the up-timer/down-timer differences in the 1632 series seem like nothing. As a long-time 1632 fan, I also loved the juxtaposition between the two series. Some of the things that have been such a pain for Grantville to acquire are really easy for the New Americans to get because they have a cruise ship that can take them anywhere, they have the (admittedly tainted) fount of all human knowledge that is Wikipedia, and they have the advantages of "smart" technology (like translator tablets) and modern computer-assisted machining, allowing them to (for instance) build powerful weapons from scratch in a believable but surprisingly short time. That said, whereas Grantville was a living breathing city full of families, the New Americans have a disproportionately old population and must assimilate others into their society if they have any hope of surviving, much less passing on their traditions. In an interesting side-note, the characters of the Alexander Inheritance are aware of the Grantville/Alexandria disappearances and thanks to that knowledge they are much quicker to figure out what's happened to them. In another major difference, the 1632 series has been driven by the unity of the vision of the main protagonist, Mike Stearns and his friends, family, and allies. In the Alexander Inheritance, the New Americans are divided (and somewhat bitterly at that) between the views of a U.S. Congressman, the ship's captain, and a historian on holiday. Each of them has different priorities after "The Event" (as they call the Ring of Fire), the captain is worried almost exclusively with the day-to-day survival of the ship (the narrow perspective), the historian sees a chance to nudge history down a different path and she is rather forward in testing her thesis (the broad perspective), while the congressman sees his duty as being finding a place for the people of this ship to survive and rebuild in this strange old world (somewhere in the middle). The difference between these POV's (and the inherent lack of bonds among the crew/passengers given the utter happenstance of their coexistence) makes relations among the New Americans quite tense in the early chapters of the book. Another key difference is that whereas 1632 is driven primarily by the actions of the up-time characters (at least in the early books) and spends most of its time developing those characters, the Alexander Inheritance is much more interested in the locals rather than the New Americans, and the book does a good job of developing the personalities of the many key players among Alexander's generals and family.
What I didn't like: I'm going to go on a bit here about one thing that REALLY bugged me, and from the big picture of the story it was minor, but it rubbed me all sorts of the wrong way due to the shear pointless idiocy of it. Namely, what I'm talking about is the "Baptist" pastor who wants to pave the way for Christ's arrival (reasonable, I guess) and declares (later in the book) that he wants to prevent his crucifixion, which is one of the most ludicrous statements a fake-Christian in a book has ever made since any halfway knowledgeable Christian would know that the death of Christ is an essential underpinning of the doctrine of salvation. It is lazy characterization by the authors and either reflects a frankly shallow understanding of Christian theology (unlikely given how important it is in the 1632 books) or an intent to make the only identifiably Christian character in the book into a laughingstock, which is sad, because there's some good potential in the crisis of faith of a man who must deal with the fact that he is in a universe where the crucial event underpinning his beliefs has not yet happened and where he must decide if its happening in this universe matters or if the fact that it happened in another universe is enough. THAT would've been an interesting character arc, and given the frankly horrific nature of the local customs the New Americans encounter, there's far better use for a Bible-thumping Baptist than running around Canaan like an idiot, but the authors either chose not to see this or were too blinded by their own preconceptions to see this possibility. This character arc, while secondary to the story grated me whenever it came up, especially since all the other religious figures are given far more credibility, even the societies who literally MURDER CHILDREN as sacrifices to their gods (think about that statement for a bit because that perfectly encapsulates just how lazy and stupid this characterization is). Another thing that bothered me is that the personalities and backgrounds of the New Americans are given surprisingly short-shift as is their plot arc. While I understand that (as with the 1632 series, which has shifted its focus to down-timers over the course of the series) the most important figures are always going to be the people with the power in the then-now and that's Roxane and Eurydice and Ptolemy, etc., but it's hard to really connect with them as people, particularly given just how, hmmm... extreme some of the differences in cultural mores are. Even worse, it feels like the authors cut out big sections that would've been focused on the New Americans (particularly, the siege of Fort Plymouth, the Orinoco Expedition, and the aftermath of the Tupky War, all of which occur for the most part off-page despite how important they are to the future of the New Americans in this world) as they basically drop out of the story in the second half and everything we learn about them is via info-dumps, which is disappointing. Finally, the ending of the book is rather abrupt and brings little closure to any of the major plot points
All in all, I loved the story, I liked most of the characters, I enjoyed how this series acts as a counterpoint and sort-of reboot/spin-off of the 1632 series (though obviously, we're still getting 1632 books, it's a reboot in the video game/movie sense, in that it's been long enough since the original came out that you can do the same basic idea but with changes in tech and culture, you get a very different sort of story). I was annoyed by the religion element as Flint and company seem far too willing to trash monotheism even while making it perfectly clear that the pagan religions of the Mediterranean were blood-thirsty and provided pretty much no moral guidance, encouraging their followers to do whatever they liked so long as they made the right sacrifices to the right gods. Their unwillingness to put any serious thought into the collision of modern day religions and ancient religions is frankly an embarrassing misstep (especially given that just four centuries on, Christianity would be spreading like wildfire among the still mostly-Hellenistic world of the eastern Mediterranean) in an otherwise fascinating book that takes its premise seriously while also having a lot of fun and is fully deserving of a sequel (and possibly its own series as I would be very interested to see what this world would look like 10 or so years down the road).