Book recommendations for 6th graders?

Hi guys ! This is my first time ever being a camp counselor, we ship out on May 11th. They’re not allowed to have their phones so we’ve been instructed to bring a book to read with the group each night. I don’t want them to feel like little kids though, can anyone recommend me some short story books we can read at the campfire that are interesting but not too kiddy because it’s for pre teens? Thank you !!