Elmer Gantry is a book written by a man named Sinclair Lewis a really long time ago. It's about a man named Elmer Gantry, who is a big talker and a smooth operator. He's really good at convincing people to do things, even if those things might not be good for them.
Elmer starts out as a salesman for a company that sells bibles. He's really good at selling them and he becomes really popular. Eventually, he starts to preach and people start to follow him. They think he's a great preacher, but really he's just really good at faking it.
As time goes on, Elmer becomes more and more popular, and he starts to get really rich. He has a lot of followers and he uses them to make money. He's not really interested in helping people, he's just interested in helping himself.
Eventually, Elmer's bad behavior catches up with him, and he gets caught doing something really bad. He loses all of his followers and his money, and he ends up alone and unhappy.
In the end, the book is a cautionary tale about how it's not a good idea to be selfish and manipulative. It's important to be honest and to care about other people, even if it means you might not get everything you want.