Three sisters, Brielle Lake, Kelly Lake, and Samantha Lake, are on a college break when they learn their grandfather has died and left them a motel in his will. Their father, John, tries to talk them out of going, but Brielle, Kelly, and Sam press ahead, flanked by friends: Tanya, Ben Graham, Bill Welsh, and Bill’s girlfriend, Amy Leigh.
Sam arrives first and, while sipping wine in Room 6, two brutal intruders burst in and attack her. They bind her legs with duct tape, place an iron bar beside her ankles, and use an axe head to drive the bar through both of her ankles. Later, the assault escalates in a boat: the same assailants lash Sam’s legs to a heavy concrete block and dump her into the water, where she drowns as the block sinks.
The others reach the motel and meet the caretaker, a kindly-looking elderly woman. The group soon discovers a lake on the property and takes a swim, blissfully unaware that Sam’s corpse floats beneath them. Afterward, they return to their trailer and set up a small camp. Bill and Tanya venture into the woods to gather firewood and end up sleeping together, much to Amy’s dismay. They also encounter large, scruffy men who seem menacing, heightening the group’s fear.
Tragedy compounds quickly: Bill, Tanya, and Amy are butchered, and the remaining friends manage to escape, only to be pulled back by a pushy, seemingly helpful cop. The cop and caretaker are not what they seem; they’re part of a larger evil scheme to force Brielle and Kelly into a brutal family tradition. The cop and caretaker are revealed to be son and mother, continuing a legacy rooted in incest that has tainted generations.
As the truth unfolds, it becomes clear that Brielle and Kelly’s father rejected the family “tradition” and escaped. Their grandmother unravels a violent inheritance plot to lure the sisters to the motel so her son can forcibly impregnate them and carry the bloodline forward. Sam’s death is explained: she was adopted, not a true sister.
The sisters refuse to follow in their relatives’ footsteps. Ben appears to kill both of the inbred men and moves to rescue Brielle from a barn where the cop has taken her to rape her; the grandmother is then shot in the head by Ben. During a chaotic confrontation, the cop shoots Ben, but John, Brielle and Kelly’s father, arrives at the last moment and kills his brother, delivering a stark line that seals the end of the cycle:
> That's how you fuck family
John then carries his daughters and the still-living Ben to a hospital. In the haunting final moment, four teenagers approach the motel, drawn by curiosity. One of them feels a chill about entering, and a surviving inbred watches from behind a tree, letting out a piercing scream as the scene cuts away.
