There’s actually a good book. It’s kind of out of print. I think it’s hard to track down. You maybe you can find online somewhere. It’s not the obvious one. The name of the book is called The Art of Manipulation.
I found it because of a tweet that I followed from @illacertus and it was really good. This guy basically goes undercover and lives with con men. He spends time with them running cons and learning all about cons. Without judgment, he just lays down how con men work. He put down there how to spot them when they’re being dishonest. Some of the telltale signs are they will push the deal a little bit too hard. They’ll sell just a little bit too hard. They’ll talk about how honest they are.