Perfect title. The story definitely "escalates" in this book, making parts of it a real page-turner. The continuing saga of the ins and outs (HA) of worm holes continued to hold my interest, and will surely appeal to other science nerds like me, and the good vs. evil, Armagedden-type threat of WWIII should appeal to just about any thrill-seeking adrenaline junkie who doesn't mind missing an hour or two of sleep. (Hey! Nobody says you HAVE to stay up until you finish reading it... but there's a good chance you may WANT to.)
The writing in the first 2/3 or so of this book is much smoother and free-flowing than in the first two books in the series, and there are fewer spelling and grammatical errors, as well. Clearly, those 2/3 received more strenuous editing than the first two books, and the last third of this one. Even so, the creep of editing lapses into the last part of this book wasn't enough to overshadow the quality of the story itself. It's a terrific story, from page one of the first book in the series until its conclusion in this book.
My only real criticism of this book is over its conclusion, though. Not how the story itself ends, but how the ending is relayed to the reader. I would have preferred "being there" to see how things unfolded, rather than merely "hearing about it" after the fact from the characters in a sort of adventure post-mortem. I wanted to EXPERIENCE the events, rather than just HEAR about them. After all the excitement throughout the book, this mode of conclusion felt like a little bit of a let-down. (YES! I AM one of those thrill-seeking adrenaline junkies!) Also, one character is described as having hazel eyes at one point in the story, and is later described as having big blue eyes. Could be an editing lapse... or maybe she got colored contact lenses. If so, I'd sure like to find some of them to try on for size. My old eyes are still hazel/green, and at my age, it's been years since anyone described my eyes as being big...
Bottom line, I'd have to say this last book in Tremp's trilogy is his best, and it's been a pleasure to observe the progress in his writing ability. I'd rate it a solid 3 1/2 stars, rounded up to four, and without a doubt, I'll be reading whatever book he may come up with next.