Bone Lake

Sage and Diego arrive at the lakeside country house only to discover another couple, Will and Cin, has also booked the same property. With the house effectively double-booked, the four decide to share the weekend rather than cancel. The tense arrangement sets the stage for a weekend of testing boundaries and distrust.

The couples spend the day swimming and cooking, all while Will recounts Bone Lake's rumored killer history. He threads a sense of danger into the day, fueling unease. Will and Cin also make sexual advances toward Diego and Sage, ratcheting up the tension in the house.

Will discovers that Diego plans to propose to Sage during the weekend using his grandmother's wedding ring. The revelation adds a new layer of competition and jealousy to the fragile weekend. The knowledge hangs over the group as plans unfold.

During breakfast, Will unexpectedly proposes to Cin with Diego's grandmother's ring, which he has stolen. Diego confronts Will privately, and Will apologizes, claiming Cin is cheating on him and that he stole the ring out of desperation. Diego reveals that Sage cheated on him early in their relationship and expresses sympathy, while Will vows to return the ring by the weekend's end.

Sage accompanies Will into town to buy groceries, and Will reveals that Diego claimed Sage masturbated in the bathtub and that Diego fears he cannot sexually please her. He then begins making unwanted advances toward Sage, further complicating the couple dynamics. The trip underscores how manipulation threads through their interactions.

Cin makes a move to seduce Diego at the house, adding a dangerous layer of sexual tension to the already tense situation. The attempt highlights how the couples' insecurities feed into the conflict. The moment raises the stakes for everyone involved.

That night, Cin proposes that she and Sage take molly together, and Sage agrees. The decision marks a turn toward psychological games and manipulation as they navigate trust and control. It foreshadows the deeper mind games to come.

Later, Diego confronts Sage, and she confesses she feigned taking the drug, suspecting that Will and Cin are trying to manipulate them and drive a wedge between them. The confession deepens the sense that the weekend is being engineered as a trap. The group grapples with whether they can trust each other.

Sage and Diego attempt to leave in their electric car, but the charger has been removed and the battery will only take them a few miles. Will confronts Diego, claiming to have slept with Sage, which she denies. As they try to back the car out of the driveway, Cin rams the vehicle with hers, cutting off their escape.

Sage and Diego awaken bound in the house to discover Will and Cin are actually Thomas and Alice Price, siblings of a wealthy publishing family. As teenagers, the siblings allegedly began an incestuous relationship and murdered their parents. They have since tormented six couples at their estate to test the strength of relationships.

The couple attempt to flee again, but Cin pursues Sage with a butcher knife. Diego hides under the boat dock and stabs Cin through the foot, trapping her. The struggle escalates as the other two plan to escape the nightmarish trap.

Will, now armed with an electric chainsaw, charges at Diego, but Sage strikes him through the head with the axe, killing him. The violent conclusion ends Will's reign of terror in the house. The immediate danger shifts toward Cin and the escape attempt.

Sage and Diego manage to fend off Cin as they flee on a boat, but Cin attacks them and Diego injures her hand with the axe, dismembering her fingers. Cin falls into Bone Lake, her hair caught in the boat propeller, and she is killed by the spinning blades. The couple's escape becomes a grim victory.

Floating on the lake after the carnage, Diego removes his grandmother's ring from Cin's dismembered finger and proposes to Sage. They laugh hysterically at the absurdity of their situation, then fall silent as they drift away together. The wedding ring marks a cruel twist of fate and a bleak ending.