Tegan Werner, a grocery clerk in Lewiston, Maine, is nearly eight months pregnant and barely scraping by. Attorney Jackson Bruckner has arranged a lucrative nondisclosure agreement with real estate mogul Simon Lamar, the baby’s father, that would guarantee lifelong support in exchange for silence. On the day of signing in Tegan’s studio, Simon arrives contemptuous, and the contract bars Tegan from telling anyone—even her child. When Simon’s cologne triggers a vivid flashback, Tegan remembers being drugged and assaulted the night she conceived. She refuses to sign, threatens to go to the police, and Simon tears up the agreement, vowing retaliation. Jackson, shaken and defensive, pushes her to sign anyway, revealing his alignment with Simon’s interests.

Devastated but resolute, Tegan decides to drive north to her brother Dennis’s home. She leaves late in a worsening snowstorm, becomes lost with failing GPS, and gets a choppy call from Jackson warning that Simon has contacted the police. As she tries to pull over, her car slides on ice and slams into a tree. Injured and trapped, Tegan fears for her baby until she feels movement. A green pickup stops. The driver, Hank Thompson, digs her out, carries her to his truck, and brings her to the remote cabin he shares with his wife, Polly, a former nurse, because the hospital is unreachable in the blizzard.

With power and phones down, Polly settles Tegan on a basement hospice bed. At first, Polly’s competence calms Tegan, but unease builds: a bruised wrist on Polly, Hank’s looming presence, and Tegan’s missing phone and pepper spray. Polly enforces pregnancy “safety,” offers only Tylenol, and quietly pockets Tegan’s phone and spray. Upstairs, tension erupts between Hank and Polly; downstairs, Tegan endures rising pain, false labor scares, and isolation.

When electricity returns but phone lines remain dead, Polly’s control hardens. She lies about the roads, “sedates” Tegan with Benadryl hidden in food, and strings her along with promises of an ambulance. A lone officer, Malloy, visits about the missing person report; Polly refuses him entry, manipulates Hank into lying, and permits only an outside search. Meanwhile, the neglected neighbor child, Sadie Hambly, drifts into Polly’s orbit, exposing the abuse of her father, Mitch, and feeding Polly’s grief over infertility and a career-ending Incident at the hospital. Polly’s fixation shifts from helping Tegan to keeping Tegan’s baby.

Tegan pushes back: she provokes Hank, who threatens her, then arms herself with a syringe needle found in the basement. Polly prepares a castor-oil “Midwives Brew” to spur labor, lies about its contents, and nearly succeeds in drugging Tegan again. When Polly lets slip that Dennis visited the house searching for her, Tegan explodes and holds the syringe to Polly’s neck. Polly coolly talks her down, warning that Hank will come if she leaves, and confiscates the needle. Tegan tries lighting a magazine to trigger the smoke alarm, but there is no alarm in the basement; Polly smothers the fire and seizes Tegan’s lighter.

Polly’s obsession escalates to violence. In the night she creeps downstairs with a hammer, intending to shatter Tegan’s good kneecap to prevent escape, then loses her nerve at the last moment. Soon after, Tegan spikes a fever, grows delirious, and loses feeling in her left foot. Polly finally removes the boot: the trimalleolar fracture is grotesquely swollen, purulent, and likely septic. Though she admits Tegan needs IV antibiotics and a hospital, Polly refuses to involve authorities. She impersonates a doctor by phone to obtain oral cephalexin and enoxaparin from a pharmacy, planning to treat Tegan herself and deliver the baby at home.

While Polly is gone, Hank defies her. He carries the barely conscious Tegan to his truck and drives her to Roosevelt Memorial Hospital, pleading at the entrance that Polly is a good person. In Labor and Delivery, Dr. Tewari starts fluids, IV antibiotics, and morphine for Tegan’s pain and washes out the infected foot. Staff warn she could have died—and may still lose the foot—but the baby’s heartbeat remains steady. A detective informs Tegan that her brake line was deliberately cut the night before the crash, tying the sabotage to Simon Lamar. Dennis arrives, exhausted from the search; Tegan senses an odd familiarity when he speaks to Jackson in the waiting room and refuses to see Jackson.

As Dennis briefly steps out during shift change, Jackson slips into Tegan’s room, apologizes for doubting her about Simon, and claims he wants to help. Tegan presses the call button, but staffing is thin. Meanwhile, Polly, terrified of prison, dons scrubs and an old badge to infiltrate the hospital intending to silence Tegan with a pair of kitchen shears. In Tegan’s room, Polly instead finds Jackson attempting to attach a syringe to Tegan’s IV. Polly confronts him; he flees; Polly and a tall, bespectacled man—Dennis—pin Jackson until security arrives and retrieves a syringe likely filled with morphine, a dose that could be mistaken for a nursing error if lethal. Polly slips away before anyone scrutinizes her badge. Detective Maxwell later confirms Lamar paid someone to cut Tegan’s brake hose and places him in custody; he also reveals Dennis had aligned his ski-resort deal with Lamar’s money and pushed to keep Tegan quiet. Jackson apologizes again, saying his dropped pre-crash call had been to declare he believed her and would back her with police. Tegan remains unsure what to believe, but she recognizes that the masked nurse who intervened was Polly.

Polly reunites with Hank outside the hospital; shaken, she chooses him over her obsession, promises to see Dr. Salinsky, and heads home. Police lights blaze on their street—but the crisis is at Mitch Hambly’s house. Officers report Mitch, drunk, fell and suffocated in the snow; Sadie is safe and will be placed. Later, Hank privately reveals he suffocated Mitch to protect Sadie after seeing new bruises, a truth he and Sadie silently share.

In the aftermath, Tegan delivers a small but healthy daughter, Tia Marie Werner, after a brief NICU stay. She tells police she recalls little of the days after the crash, choosing not to expose Hank and Polly; she credits Hank for the rescue and knows Polly stopped the IV attack. Jackson visits daily, arranges in-home help, and forces immediate child support from Lamar, who is jailed for his crimes. Dennis is sentenced to 10–15 years for his role and related offenses. Tegan plans for nursing school when Tia is older and considers a cautious future with Jackson, but she resolves never to reveal what happened in the basement. Polly and Hank foster Sadie with Dr. Salinsky’s support and move toward adoption; Polly reframes family around the child they can protect.

A final standalone vignette, The Boyfriend, follows Sydney on a disastrous online date with a man who lied about his identity and pressures her to drink, a sharp coda about vigilance, boundaries, and the everyday hazards women navigate.