I think I found it. It was made by spa owner to lure in rich clients. Spa owner would say they have ancient secret book, written by alchemist monk, of how to tr

I think I found it. It was made by spa owner to lure in rich clients. Spa owner would say they have ancient secret book, written by alchemist monk, of how to treat any disease. They may even show the book to them, saying only their workers know how to read it.