I was already a fan of Wayne Thomas Batson's previous fantasy trilogy The Door Within, The Rise of the Wyrm Lord, and The Final Storm and his two pirate adventures Isle of Swords and Isle of Fire, and I knew Christopher Hopper's The White Lion Chronicles Rise of the Dibor and The Lion Vrie by reputation so I leaped at the chance to try the product of their collaboration. I'm glad I did because while it is not perfect (what is?), it is very, very good, and I thoroughly enjoyed it.
As other reviewers have pointed out, having SEVEN heroes asks an awful lot of the reader; we don't finish meeting them all until Chapter 16! Now to Batson's and Hopper's credit, I DIDN'T need a chart to keep the heroes straight, which I half suspected I would need, in fact the seven leads are quite distinctly drawn: 4 boys, 3 girls; 1 child prodigy, 1 star athlete, 5 middle of the pack; 1 Asian, 1 Black, 4 Whites, 1 kind of Bluish; 1 Briton, 1 Korean raised French, and 5 Americans. However, I cannot say the same about the two dozen or so Sentinels and Dreadnaughts; I don't even know for certain how many of them there are. It doesn't help that so many of them occupy similar roles as librarians, booksellers, and teachers. Add to that six sets of parents, school chums, plus all the characters back on Allyra, and, well, the reader will be referring back to the three pages of Principal Cast Listing, which contains nowhere near the entire cast, quite a lot. Let us hope that with the transfer of action to Allyra and the presumed absence for the duration of all the characters left behind on Earth, Batson and Hopper will not be continuing to introduce a bunch of new characters.
Batson and Hopper wisely cover the Allyran back story exactly once, picking up different bits and pieces from each hero's reading of "The History of Berinfell". They also keep things interesting by staggering the heroes' stories; when switching between main characters, they are all proceeding down their superficially similar experience paths at different rates and doing some things in different orders. The result avoids either confusion or boredom, a nice trick.
You never know exactly how the work of two individually published authors will change in collaboration; events have yet to begin moving with that relentless "Batson pace" so familiar to his readers, but that may be because they spend most of this first book just introducing the cast! In any event I am well and truly hooked and eagerly looking forward to the next book in The Berinfell Prophecies Series Venom and Song.