The only problem I have with this book is that it's too short. Perhaps where it ends is the right point, because it makes you think for yourself what actually happened, and what whould happen to the main characters after the incident. But take it as a compliment that I wanted to read more about these characters.
The story is about a stigmatic who may also have healing powers. One of the good points of the book is that they explain the phenomenon of those who have stigmata. For those uninitiated, this is the condition where humans periodically experience the wounds suffered by Christ at his crucifixtion. They actually get holes in their hands and bleed. This has been documented enough to prove it does indeed exist. Whether it is due to an extreme power of self-suggestion or an actual miracle I will leave to the reader.
Ditto with the healing power. The main character seemingly has this, and Leonard teases us by not showing any healing until the end, and that is even written to make us wonder. It does, however, have the actual stigmata occur, and when it does, it is powerful writing by the author.
Of course, being a Leonard novel, you have to surround him with a cast of con men and hucksters that see how they can benefit from this. What is tantalizing is that we never really know if the central character is good or just another con man. We think he's good, and we want to believe he's good, but Leonard just leaves little hints to make us wonder ourselves.
I'll also not reveal if he's a good man or not, and for that matter, I might be wrong myself. I highly recommend you read it and make your own decision.