I enjoyed this book in part because the stories of relic thefts, and the lives of the stolen Saints, sometimes seemed too improbable to be true, and yet one cannot deny the obvious impact those same stories had (whether true or not seems irrelevant to their legacy) on the communities that obtained them. I found is rather funny that monks would invent theft stories to imbue a Saints remains (obtained legally) with more pizazz, in the hopes of drawing more pilgrims and donors. I also laughed during the descriptions of the miraculous second body that often accompanied disputed claims to a Saint, who often, it seemed, was unknown to the world until calling out to a wandering monk or two.
I make light of several of the stories, but the book was fascinating, and Geary does a good job of putting the cult of relics and their thefts in cultural and historical perspective, which when seen with that eye, are perfectly normal and important to the spiritual and communal development of the time period. In context, the book and its stories become even more meaningful as we look at how certain things influence us. There is no denying the power relics had then (and now), but through 21st Century eyes, sometimes it's hard to believe.
This book is short, well written, but probably not for the casual reader. It is full of phrases in latin, is written for an intellectual audience, and assumes some familiarity with place and time. I really liked it despite likely being outside the target audience.