The Knock Knock Blu-ray features a thrilling mystery/suspense storyline directed by Eli Roth and starring Keanu Reeves, Ana de Armas, and Ignacia Allamand. This R-rated release from 2015 on Blu-ray format is packed with suspenseful moments and intense performances. With one disc included, this film is sure to captivate audiences with its gripping plot and talented cast, making it a must-have for fans of suspenseful thrillers.