Equilibrium (2012)

Felix is a murder mystery writer that has trouble separating reality from fantasy. Both he and Kate are persuaded to meet each other at a social gathering in a cabin in the woods. After some bizarre introductions the situation becomes gruesome. In their efforts to escape Felix and Kate discover the circumstances are more than what they first perceived. As they peel back the layers they discover that murder, in a manner of speaking, may be comical, romantic and justified.