Architect and happily married man Evan Webber (Keanu Reeves) has the house to himself and his dog, Monkey, on Father’s Day weekend due to work and a physical therapy appointment for a shoulder injury while his wife and children go on a family-planned beach trip. His wife Karen (Ignacia Allamand), a successful artist, leaves their assistant Louis (Aaron Burns) in charge of her sculpture that needs to be moved to an art gallery for her show.Knock Knock 2015.
Two women, Genesis (Lorenza Izzo) and Bel (Ana de Armas) knock on Evan’s door during a rainstorm. Soaking wet, they tell him they are looking for the address of a party. As their phone is not working, Evan allows them in to dry off and use the Internet to get hold of the party’s host. He gives them robes so they can dry their clothes in his dryer. The girls make themselves at home and flirt with Evan while he orders an Uber for them and plays a few of his old vinyl records from his days as a DJ. They then disappear to the bathroom when their driver arrives. Evan brings them their clothes and finds them nude. He tries to convince them to leave, but as they start forcing themselves upon him, he gives in and has a threesome with them.
The next morning, Evan finds out that his wife’s sculpture has been vandalized by the girls. When Evan threatens to call the police, the girls claim they are underage. Vivian (Colleen Camp), a friend of Karen’s, stops by to see if Evan needs help. Seeing Genesis, Vivian angrily leaves. When Evan threatens to report a break-in, they give in and agree to be taken home.