La meute (2010)

A young female Charlotte on a road trip all alone gets harassed by a group of bikers at a snack store and later she gives lift to a hitchhiker Max. They both stop at a rundown roadside eatery run by a woman. The biker gang reappears at the eatery and when one of the gang members is about to rape Max, the entire gang is chased off by the owner of the restaurant. Moments later, Max vanishes after heading to the bathroom. Charlotte questions the owner and a retired cop but to no avail.