Knock Knock is a story of a husband and father who had always been devoted to his family. He was left alone at home for the weekend when two young women knocked his door for help. He helped them and in return found the girls trying to seduce him. A fatal game of cat and mouse stars when a kind gesture resulted into dangerous seduction situation. It turned the dark fantasy of this married man into the worst nightmare of his life. Watch the movie to know what happened that night and why he was dragged in this situation.