Help develop a class

Hi all. I teach HS English, and one of my classes is a mystery and suspense class. The class is only open to seniors, and it’s a work in progress after recently being revived. I don’t love the options my school has for books, and I will have money to purchase new ones. I’m looking for a recommendation to add to my possible purchases. I’m already pretty sold on Those Who Me Dead by Michael Koryta and One by One by Ruth Ware. These should go over well with my population. I’m looking for a 3rd book that is a mystery/suspense/thriller novel and will keep the attention of HS students. What would this community recommend?