Most reviews focus on Frank Bowen and his wife Liz, her disappearance and his frustration with being unable to find her. Oh, did I mention this happened in the jungles of Belize?
But I think the real story is the one running in parrallel. The one about the young somewhat primitive warriors from a (parallel?) universe. That enter our world, and others, through the Xenoliths. They are intriguing characters. And A.Sparrow's description of their adventures in our world has a nice "feel" to it.
I give the book a high rating because it is a first book and because of the "feel".
Read the book and experience it.
Then go on to Peregrin and read more.
(reviewed 12 months after purchase)