What if there were sequels to a bunch of pulp books I never read in which their protagonists confronted Professor Moriarty (of the Sherlock Holmes stories)? Those Sherlock Holmes stories that I thought were OK but which other people like a lot better than I do? Then you'd have this book. I didn't make it very far. I might have found it more compelling if I'd known more about the protagonists of Riders of the Purple Sage whom I was supposed to be rooting for. I might have.