Knock Knock is out now on DVD and Blu-Ray, released by Entertainment in Video.
Keanu Reeves stars as Evan Webber, a happily married architect who appears to have everything a man could ever dream of – a loving and successful wife, two beautiful children and an expensive home.
During a weekend alone, his peaceful existence is interrupted by the sudden arrival of two lost and seemingly innocent young girls.
After naively inviting them in while they wait for a taxi, the night takes a sudden and disturbing turn when a debaucherous mistake evolves into a living nightmare.
To be in with a chance of winning Knock Knock on DVD, just answer the question below.
The competition closes at 23.59 (GMT) on Friday 20th November 2015.
*You can enter once per day to increase your chances of winning but please note, only one entry per day will be counted*