Solid Sigma Tale. Unlike a certain reviewer who claimed that this was a standalone book, I'm going to tell you right now that you need to read at *least* books 14-17 (ish) before coming into this one in order to fully understand and appreciate it. But once you've read those other books, you're going to want this one anyway... and you *will* appreciate likely the very same things I liked about this book - namely, certain elements of its ending. Which is all I'll say without going into spoiler territory.
Beyond those ending elements, this is a standard-ish globe trotting Sigma Force action/ thriller, emphasis on the action. And yes, it is about as plausible as the Fast and Furious franchise at this point, but you don't come into these kinds of tales wanting or expecting the ultra-realism of say Andy Weir's The Martian. You come into these types of books *wanting* to see the motorcycle vs attack helicopter fights, the desperate and last second escapes from traps of various forms, the ultra close quarters action where blades get left stuck between arm bones... and, yes, with now *two* very well trained war dogs, Tucker and Kane and Marco's scenes damn near steal the show every time they come up, ala the "motorcycle ride with the raptors" from the first Jurassic World movie that Universal's Islands of Adventures' Velocicoaster captures so well with its initial launch. Because *that* is the kind of adrenaline rush you want in a rollercoaster and in a tale like this, and by God James Fucking Rollins is going to give you that in *spades*.
Some people like Hallmarkie romance books. Others like This Is Us level dusty-rooms-every-other-scene dramas. Others like more pure scifi ala the aforementioned Weir or the more scifi based Rollins type action of Jeremy Robinson. Some like their fiction to be ghost chili level damn near erotica spicy, others don't like reading the word "fuck" at all in anything whatsoever. There are all kinds of books for all kinds of readers, in other words, and if you like the type of book that Rollins continues to write, well, you're gonna like this one too.
Very much recommended.