Martyrs

Martyrs is a 2015 American horror film directed by Kevin and Michael Goetz, written by Mark L. Smith, and starring Troian Bellisario, Bailey Noble and Kate Burton. A remake of Pascal Laugier's 2008 film of the same name, the story sees a woman who, after having been kidnapped and tortured as a child, goes to kill her supposed captors, and with her friend discovers the dark truth behind her abuse.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.