Jay Moore, Micah Stock, finds his life spiraling after his wife Maggie catches him with child pornography on his phone. He insists he only provides the pictures, not derives pleasure from them, but Maggie contends that still makes him an accessory to the crime. He pleads with her not to go to the police and seeks counsel from a friend who suggests a risky path: consult a mute hitman named Kosco, Happy Anderson. Jay explains to Kosco that Maggie plans to report him, and asks for a scare rather than a killing to keep things contained. In a twist that will set the agenda for the case, Jay buys a lottery ticket in Maggie’s name and discovers there are two Maggie Moores in the system, a finding that foreshadows a much larger, interwoven tragedy.
Maggie tells her neighbor Rita, Tina Fey, that she is divorcing her husband. When Maggie gets into her car, Kosco suddenly appears from the back seat and points a gun at her, shattering the quiet of the neighborhood. Soon thereafter, officers are alerted to a burning smell and head to the scene, where they find a car with a skeleton in the front seat. The car is registered to Maggie Moore, and Rita tells Sheriff Sanders, Jon Hamm, that Maggie had a volatile relationship with her husband. The news hits the town hard, and the police work quickly to connect the dots between the apparent arson and the mysterious deaths surrounding the two Maggie Moores.
Sanders spots Jay at his store and informs him about his wife’s death, a moment that forces Jay to confront the consequences of his plan. He visits Kosco to ask why he killed his wife instead of scaring her, and Kosco replies that it was because she fought him. The conversation lays bare the chilling calculus at the heart of the case: a calculated murder to erase a threat, not merely a prank to frighten. Jay then tries to leverage Kosco again, asking him to kill the other Maggie Moore to make the first murder look like a case of mistaken identity. This escalation drags more innocent lives into a net that grows increasingly tangled and dangerous.
Rita and Sanders go on a date, and she tells him that Jay missed part of his wife's funeral because he was talking to another man. She recalls that this man was driving a truck for Liberty Bell foods, a clue that deepens the police’s suspicion about Jay’s circle. Sanders deduces that the truck driver could be Tommy, a person who then reveals that Jay bought expired food and sold it to his restaurant customers illegally. Kosco, meanwhile, kills the other Maggie and grabs her insulin kit, which bears her initials, a detail that becomes a critical link in the investigation.
Sanders receives word of two Maggie Moores dying within a week of each other, and the case tightens around Jay and Tommy as plausible suspects who could have orchestrated a double murder. The second Maggie Moore’s husband, Andy, Christopher Denham, tells the cops that the killer was likely Duane Rich, a coworker who used to bully her. Duane is confronted by the authorities and admits he was an alcoholic who has since recovered, presenting himself as a reformer who hosts an AA meeting at his home. The world of the investigation widens as investigators question whether the two deaths are connected beyond a shared surname.
Sanders and Rita go to a casino and share a room for the night, but Sanders struggles with emotional turmoil and guilt, haunted by memories of his own wife. The pair watches TV news coverage in which a woman named Cassie reveals a recent affair with Andy Moore and claims Maggie Moore’s life insurance is worth $700,000. Andy is interviewed and mentions Duane Rich, a clue that ties back to the motive and potential line of suspects. Jay watches the same coverage and devises a plan to remove Duane Rich, hiring Kosco again to stage a suicide and create an alternate culprit for the two Maggie Moore deaths.
Cassie provides officers with a list of motels she stayed in with Andy, and the police confront Andy with this new information. He admits the affair but denies involvement in any other crimes. Kosco then kills Duane at his residence, and when the police arrive, Duane is found hanging with a suicide note confessing to both Maggie Moore murders. Yet Sanders remains skeptical: if Duane knew Maggie #2, why would he have anything to do with Maggie #1? Forensic clues begin to point to a more complicated chain of events, including Maggie #2’s insulin kit going missing and the possibility that the killer moved through multiple angles to cover their tracks.
Andy confirms that his wife never left home without her insulin kit, a detail that keeps pointing back to the insulin-linked crime. Jay’s assistant Greg discovers a smashed phone belonging to Jay and mails it to the cops, who press Tommy about texts on the device and learn more about Kosco’s involvement. When Sanders and Deputy Reddy confront Kosco, he speaks fluently for the first time and claims he is Don Lindowski, insisting an intruder had lived in his home for several days without his knowledge. This dramatic reveal unsettles the investigators and suggests a deeper deception at work. As they leave, Sanders whispers to Reddy that the insulin kit with Maggie’s initials found in Kosco’s home could be a crucial piece of the puzzle.
Kosco fires at the officers, escapes in a car, and heads toward Jay’s home to finish the job. Rita, hearing the gunshots, tries to flee but Kosco enters her car and threatens her with a weapon. She guesses that his intention is to kill her, and she rams head-on into another vehicle in a desperate bid for freedom. The airbag on the driver’s side saves Rita, but there is no passenger-side airbag, which proves fatal for Kosco in the crash. The aftermath leaves Sanders reeling from the blows of the case while Rita recovers in hospital.
In the final pages, Sanders is reunited with Rita, who is recovering, while Andy is back with Cassie, and Tommy remains detained, enduring abuse at the hands of other prisoners. The film closes on a note that underscores the fragility of truth and the way a web of lies can pull in multiple people, leaving a town to reckon with the consequences of fear, guilt, and the human cost of deception.
