“Knock Knock” lures you into a false sense of security with its warm and welcoming opening. We meet the Webbers, a stock-photo, picture-perfect family celebrating Father’s Day. The patriarch, Evan Webber, seems to have it all: a gorgeous house, a loving family, and a solid career. 

However, things take a drastic turn when Evan is left alone at the house for the weekend. When night falls, there’s a strange knock at the door. Evan goes to answer, greeting Bel and Genesis. These two young women have somehow gotten themselves stranded in the rain, with no phones, and in a neighborhood they don’t recognize. Out of courtesy, Evan invites them in to dry off and sort out their situation. However, a certain connection forms as he and the girls start talking. While he is initially resistant — thinking of his wife and family — he eventually gives in to temptation and sleeps with the two girls.

By the next morning, things appear to be spiraling out of control, and the girls are behaving in an increasingly erratic and unnerving manner — almost as if they are completely different people. They refuse to leave his house and threaten to falsely report him for sexual assault, claiming that they are minors. Though Evan is able to get them to leave for a brief time, they break back in, tie him up, and subject him to a traumatic night of physical and psychological torture.

If you or anyone you know has been a victim of sexual assault, help is available. Visit the Rape, Abuse & Incest National Network website or contact RAINN’s National Helpline at 1-800-656-HOPE (4673).