If A Tree Falls (2010)

Siblings Brad and Lisa Carpenter along with two lifelong family friends Will and Vanessa set out roadtripping to an annual family reunion They make the decision to find a place to stop and camp for the night What ensues is a violent disturbance by six masked assailants without motive or reason The group find themselves living a night of psychological games and physical terror and as morning dawns the reality of what will come is more terrifying than anything the group could have ever imagined