You're Next 4K 2011

Crispian Davison and his girlfriend Erin go to a family celebration in a country mansion belonging to the parents of the guy. However, no one manages to enjoy communication with relatives. The house is invaded by several masked killers, whose goal is to exterminate all those gathered. But the villains clearly did not count on the fact that Erin has not only the instinct of self-preservation, but also the experience of survival in extreme conditions.