Couple Sage Maddie Hasson and Diego Marco Pigossi arrive at a sprawling lakeside country house they’ve rented for the weekend, hoping to celebrate Diego’s budding writing ambitions while Sage’s new editing job supports him. The mood is warm and hopeful as they settle in, unpack, and begin to envision a quiet escape from their busy lives. Sage’s support for Diego’s dream is clear, and their excitement feels renewed as they anticipate a weekend of connection and celebration.
Not long after, they’re joined by the outgoing couple Will Alex Roe and Cin Andra Nechita, who also booked the same house. The arrival of Will and Cin introduces a dynamic shift, and it doesn’t take long for the four of them to realize the place has been double-booked. Rather than back out, Sage and Diego agree to share the weekend, choosing to make the best of an unusual situation. What begins as a pragmatic accommodation gradually reveals undercurrents of attraction, tension, and ambiguity between the pairs, as the days drift from casual swimming and cooking by Bone Lake to more charged exchanges.
Bone Lake becomes a quiet witness to the weekend’s shifting tones. Will recounts the lake’s rumored past, noting that since the 1950s an unknown serial killer supposedly used Bone Lake as a dumping ground for victims. The retelling adds a chilling air to their daytime activities, and it’s not long before the atmosphere thickens with more than just friendly flirtation. Cin and Will press closer to Diego and Sage, testing boundaries with flirtatious advances that feel both charged and unsettling. Diego, focused on the forthcoming proposal to Sage using his grandmother’s ring, finds his emotions complicated by the other couple’s provocations.
That night, the mood spirals further. Will and Cin suggest exploring a series of locked rooms they’ve discovered within the house, inviting the others to join in a game that feels more like a dare than a curiosity. One room contains an array of sex toys and a sex swing, while another holds a Ouija board and newspaper clippings about disappearances in the area. The objects and the atmosphere heighten the sense that something dangerous is at play, nudging the couples toward fragile lines and blurred loyalties.
The next morning brings a startling development during breakfast. Will unexpectedly proposes to Cin, presenting Diego’s grandmother’s ring—stolen in the process. Diego confronts Will privately, and Will offers a remorseful explanation, claiming Cin’s infidelity and his own desperation drove the action. Diego reveals his own pain, confessing that Sage had cheated on him early in their relationship, which gives his empathy for Will’s vulnerability a harder edge. Will promises to return the ring by the weekend’s end, but the exchange leaves a fresh stain on the weekend’s fragile trust.
As the day unfolds, the distance between the couples thickens. Sage ventures into town with Will to buy groceries, and a troubling rumor surfaces: Will claims Diego told him Sage had engaged in intimate acts that ignite insecurity. The tension deepens as Will makes a pointed, tense move toward Sage. In the house, Cin intensifies her pursuit of Diego, pushing the boundaries of consent and control in a way that unsettles Sage even as she tries to navigate the emotional maze between desire and safety.
The evening introduces a drug-fueled edge to the mind games. Cin proposes that Sage and Cin take molly together, a suggestion Sage initially agrees to, hoping to diffuse the mounting tension. Yet Sage later reveals that she never truly took the drug and suspects that Will and Cin are orchestrating psychological manipulation to drive a wedge between her and Diego. The couple tries to leave in their electric car, only to discover the charger has been removed and the battery will only carry them a few miles. A confrontation follows as Will accuses Diego of infidelity and claims to have had sex with Sage; Sage denies the accusation, and Diego attempts to back the car out of the driveway, but Cin rams the vehicle with hers, the crash ending the moment and plunging the four into a darker, more perilous space.
When they awaken, they are bound with duct tape in the house. Will and Cin reveal their true identities as Thomas and Alice Price, siblings from a wealthy publishing family, who have specialized in testing the strength of strangers’ relationships through brutal psychological games before killing them. The revelation reframes everything—the weekend’s games, the threats, and the apparent madness of the other couple now appear as a premeditated, deadly scheme. Sage and Diego scramble to escape, but Cin pursues Sage with a butcher knife, while Will closes in on Diego.
A desperate struggle ensues. Sage manages to defend herself by smashing Cin’s face with a glass, creating a gash and buying precious seconds. Will, wielding a menacing axe, presses the confrontation, forcing Sage to turn the struggle toward him as Diego hides nearby under the boat dock. Diego surfaces long enough to stab Cin through the foot, trapping her in the tense maze of the dock area. Cin responds with ruthless persistence, but Will presses forward with a frightening confidence, until Sage uses the axe to strike him in the head, killing him in a brutal and final moment of resolve.
With Will gone, Cin returns to the fray, attacking again as Sage and Diego attempt a frantic escape by boat. Diego lands a decisive blow to Cin’s hand with the axe, dismembering fingers, and Cin tumbles into the lake where her hair tangles in the propeller. Sage turns the boat and the propeller does its work, ending Cin’s threat in a shocking, final display of raw survival.
Floating on the lake afterward, the couple shares a moment of exhausted relief and strange triumph. Diego quietly removes his grandmother’s ring from Cin’s dismembered finger, a haunting symbol of the weekend’s turmoil, and—astonishingly—proposes to Sage. They both laugh in a hysterical, almost manic relief before settling into a tense, intimate silence, the weight of what happened lingering in the air as they drift away into an uncertain future together.
This tale blends suspense, psychological danger, and stark, unvarnished violence with a focus on how relationships are tested when fear, betrayal, and the fear of losing each other push people toward extremes. The lakeside setting and the claustrophobic layout of the house amplify the mounting tension, turning a weekend meant for celebration into a harrowing trial that forces Sage and Diego to confront what they truly want, what they’re willing to risk, and how far they’ll go to protect each other when confronted by a threat that knows their weaknesses.
