Ronnie Chase Connor Jessup died on prom night, a tragedy that casts a long shadow over the family. Five years later, Melissa Moody Margaret Qualley, Ronnie's former girlfriend, arrives at Charlene and Philip's home with startling news: she is pregnant and claims Ronnie is the father. She even plays a recording of a psychic reading to back up her claim. Charlene's initial anger gives way to wary concern as she asks Melissa to leave, but the weight of Ronnie's memory pulls them into a tense, fragile orbit around Melissa’s pregnancy.
Melissa is taken in by Bill Brian Cox and Gail Blythe Danner Erwin, a couple grieving Ronnie and drawn to Melissa’s devotion to his memory. They offer to become guardians for the baby, given Melissa’s unstable family background, and her episodes of blackouts loom large in their minds. Bill’s secret smoking and a persistent cough sit alongside Gail’s insistence that he see a doctor; the quiet domestic rhythms of the Erwin home are a constant backdrop to the looming storm.
After a tense breakfast, Philip [Nick Robinson] suggests the unthinkable—that Ronnie’s frozen sperm could have been used to impregnate Melissa. Charlene [Amy Ryan] goes to the library where she once worked to research the possibility and calls her ex-husband, Richard [Greg Kinnear], a physician. Richard’s response is cool and professional, and he later connects with Bill’s Hardware in the wake of the unsettling discussion. The family dynamic becomes a web of old loyalties, new suspicions, and stubborn defensiveness.
Charlene travels to Erwin’s to confront Melissa directly. Gail, ever protective of Melissa, reveals that Richard covers Melissa’s rent, sparking Charlene’s anger and fueling the sense that everyone is maneuvering for control of Ronnie’s legacy. Richard heads toward New York, a symbol of the tangled, partially distant ties that bind the characters.
Philip visits Melissa at her cottage, where he reflects on his broken leg—injured when a car struck him while he biked—and on his choice to relocate to New York as part of a plan made with Ronnie before his death. Melissa opens up about her blackout episodes and her dreams of Ronnie, deeper than the surface drama of pregnancy.
Back at the main house, Gail discovers Bill’s cigarette stash and a half-used blister pack of pills, prompting her to head to the pharmacy. When Bill comes home to an empty house, Gail confronts him in the basement, and the revelation hits hard: Rohypnol has been part of Bill’s pattern with Melissa, enabling the blackouts and the pregnancy. The confrontation turns violent, and Gail dies in the struggle.
As Melissa goes into labor at the cabin, Philip rushes to drive her toward the hospital, but she insists he locate Gail and Bill so they can accompany her. Philip searches the Erwin property, peering through the basement window to glimpse Bill with Gail’s body. His phone rings, drawing Bill’s attention, and Bill storms out with a shotgun to confront him. Philip’s desperate call for help to his parents signals the gravity of the situation, and Bill closes in, knocking Philip unconscious with the butt of the gun. Melissa, meanwhile, drives herself to the hospital, severing the immediate danger from the car crash that birthed it.
Bill buries a shallow grave for Philip in the barn as Charlene and Richard arrive, trying to salvage some reason from the chaos. Charlene notices one of Philip’s crutches on the ground outside, a small sign that something is terribly wrong. They rush inside to find Gail dead, and Bill’s plan to bury Philip alive escalates into a violent, fatal confrontation. Philip awakens and fights back, triggering a dramatic showdown in which Charlene stands between Bill and the others. Bill insists he didn’t mean to harm her and then kills himself, ending the immediate threat but leaving the family fractured.
Melissa gives birth to her baby, and a flashback reveals Ronnie’s death: he stood on the sunroof of a limousine, shouting that he loved Melissa, at her behest, as the limo driver, distracted by the moment, crashes. The montage of the family learning Ronnie’s fate plays out, but in the present, Melissa clutches her newborn while Charlene comforts the child, with Philip and Richard watching the fragile circle of life and loss hold steady for a moment longer.
