Eli Roth is currently prepping his upcoming psychological thriller Knock Knock. He's set to both pen the script and step behind the camera and now it looks like he's found his star. Deadline is reporting that Keanu Reeves will be headlining the film, playing a married man who's left alone for the weekend and finds his life turned upside down when two beautiful girls (Lorenza Izzo and Ana de Armas) show up at his house.