The invented mythology that fuels the plot of this book, a blend of Sumerian, Egyptian, Greek, Roman and many others that I'm sure I missed, was absolute genius. Upon reaching the portion of the book where the backstory was told (think of Frodo arriving at Rivendell and everyone sharing their stories, particularly Gandalf), I became hooked. Many of the questions I had amassed during the pages prior to this were answered, as well as ones I didn't know that I had. It's a testimony to the author's inventiveness that he held my attention from the moment the mythos was being explained until it was over. What makes it more impressive is that this took roughly forty-five pages.
The problem is that I almost didn't get there. The first chapter was a great hook, with time stopping and all, but I grew wary when inconsistencies started popping up, and I felt that certain portions of the text should have come before others and so on...and then UFOs entered the picture. I had some difficulty with Sumerian artifacts, magic books, and UFOs being in the same picture, but, like I said, all of that was answered during the explanation referenced above. Also, italics are used far too often. One uses italics to emphasize, but when they're overused, they lose their emphasis and begin to blend in with everything else on the page. The tyranny of italics...
I believe that there is a great story here, that the author has a tremendous, inventive imagination (frankly, the concepts often left me speechless), and that what separates this book from "good" and "excellent" (i.e., 3 or 5 stars) is a competent editor. Books that include time travel are very difficult to plan, organize, plot, and ultimately write.
One other thing: I thought the book ended stronger than it began (with the exception of the first chapter).
And in a second book, which is not so casually hinted at, I'd like to see the characters resolving their conflicts instead of relying on a god-like character which is, essentially, an adult. There's nothing wrong with strong adult presences in young adult literature, but the young adults in the book should be a bit more involved, in my opinion.
Still, I want to emphasize that this is *not* a negative review. Three stars, in my rating system, is "good"; therefore, this is a positive review. There's good material here, I just think with some tightening it could be even better. And personally, I'm looking forward to the follow-up to this book.