Very much enjoyed this book, the first I've read by this author, but not the last.
The serial killer plot is believable and well crafted with an interesting twist. The author, instead of going for the gore and splash, is focused on the deductive process, a much more cerebral process. There is a great deal of fascinating detail about the culture and people of several South American countries and cities as well as truly vivid descriptions of the land and the Inca history and culture.
My biggest personal "like" about this book is the fact the author did not have the one female investigator do something careless/stupid and almost become a victim, only to be rescued at the last minute.
My one personal criticism is that the habit of a pun between the main characters before going to sleep seemed a little too much of a good thing ... by halfway through the book I was skipping them.