I am looking to get a book to read when it is slow at work. What book should I read?

I used to read when I was younger but I stopped once I got to high school. I liked (and still like) books like the Harry Potter series and Divergent. What is something that is along the same realm but also not a teenager's book? I also don't want to read any of the classics like The Kite Runner. I read most of them when I was younger. I want to get back into reading and because I'm barely coping with work, I want to have something that will hold me over. What is something I could enjoy? Thank you in advance <3