Devil in the White City is also a great book, the first book of his that I’ve read. Story of America’s first recognized serial killer, occuring in Chicago during the World’s Fair. Worth checking out.
That was my first book of his I read as well, back in college when I was taking a true crime class. My school had great English electives that I kept taking for fun and it set me back a year because I didn’t have anybody smart to tell me that they didn’t get me any closer to graduating.