Knock Knock / Кто Там? (2015)

Evan - successful architect and exemplary family man who sends his family out of town, and the output remains at home to finish an urgent project. On a rainy night in his house knocking stray two young girls who are asked to shelter them for a while. Evan could not even imagine that a helping hand is in store for him a nightmare to go through to be very difficult. The young person is brought into his house a series of subtle bullying, refined torture, as well as slow sadistic destruction of his strong family. Can he find the strength to survive this nightmare?