How do you turn a short story about a sadistic child murderer into a horrifying, but hopeful coming-of-age film? If you’re director Scott Derrickson, you use your own traumatic childhood as inspiration. Derrickson’s latest film, The Black Phone, based on Joe Hill’s short story of the same name, is about a 13-year-old boy named Finney (Mason Thames), who is abducted by a serial killer known as The Grabber (Ethan Hawke, in his first villain role).