Part II in this three-part series with Billy Byrne, takes him to revolutionary Mexico as he flees the law instead of facing prison for a crime he did not commit in the first book. Of course, he runs into old friends. But that's Edgar Rice Burroughs for you.
Once again Burroughs' characters are as shallow as any cliche, but the tale is still exciting. I read dozens of his books when I was a teenager and loved most of them. Many are still on my shelves. Even as an adult, I still find them enjoyable, although the occasional racist remarks I can now do without. All the bad guys are obviously sub-humans, but apparently it is okay to not trust any of the "greasers" (Mexicans) in this story - good (well, sort of) or bad.
You have to understand that this book was written in a different time (1913) and enjoy the story line.