In Manchester, Amos, who is from a rural area and has no cell phone, buys a map from a Barnes & Noble. He recalls a month ago visiting a hardware store in the small town where he lives where the store’s owner tells him that he is gullible for thinking his wife, Jennifer, and him will reunite after their year of estrangement. The owner tells Amos, who was once the star quarterback for his high school team, that Jennifer only married him because she thought he would inherit Amos’ father’s fortune when he passed. When his father died, Jennifer grew angry and kicked him out of his childhood lakeside home to a smaller house.

Amos refuses to believe this is true and tells Jennifer he is coming over to repair a broken household item. When he gets there, Jennifer is angry with him for interfering in her space and tells him she is going out on the lake in a boat. He watches from the yard as she gets into the boat and a short while later is run into by two jet skis, with riders he fails to identify. Fellow neighbors help Amos recover his wife’s body and he rushes her to the hospital where she later dies. After the funeral, he runs into several friends and when one of them says Jennifer took advantage of him, he punches the man in the mouth.

In the weeks later, Amos contacts the police chief constantly for updates on the investigation but the chief says the chances of identifying the men on the jet skis are bleak, given that it’s tourist season and many people are coming and going without record. When he realizes he can’t rely on the police investigation, Amos takes matters into his own hands, going to the town hall to look at tax records and making a list of everyone who lived nearby and going door to door to ask neighbors if they knew the identities of the men. Finally, on the fifteenth day of going door to door, Amos speaks with his neighbor Ralph who said he saw the men at the local convenience store the day of the tragedy, filling up their jet skis with gas and drinking. 

At the convenience store, he talked to Pat who had been working the day the men passed through and Pat said he had told the police chief he didn’t have any information to share on the men. Amos pretends to be looking at candy bars and when Pat comes around the counter he kicks him in the back of his knees, making Pat fall to the ground and turns the “Open” sign to its “Closed” side and turns off the store’s lights. Amos sat on Pat’s chest and questioned him about the men. After a while, Pat admits that he remembered the men and that they had come back to the store the day after the incident and gave Pat a thousand dollars to sign a confidentiality agreement to stay quiet. Amos releases Pat and demands he give them the address from the men’s credit card.

In Chelsea, two hours after he bought the map, Amos finds himself overwhelmed by the traffic and amount of people around him in the city. He eventually arrives at the tiny two-story house of Tony Conrad, one of the men who had paid for gas at the convenience store. Amos walks up to the house with a knife and a pistol in his jacket and sees the two jet skis parked in the backyard, one with a smear of light-blue paint rubbed off on it from Jennifer’s kayak. As he’s inspecting the jet skis, five men and three women come out of the house and corner him. Amos lies that he came to use the restroom in their backyard and the men beat him up. In the morning, he gets McDonald’s and waits outside of the house. When Tony leaves, Amos follows to a small park where Tony talks on the phone for a while. Amos gets out of the truck and taps him on the shoulder and punches him in the throat and binds his legs and arms and stuffs him in his passenger seat. When Tony gains back his voice and stops yelling, Amos tells him who he is and Tony apologizes and tries to pay Amos off or go to a police station and turn himself in. Amos refuses both offers and raises his gun at Tony. Tony pleads and says he’s about to be a father and Amos releases Tony. As Amos is taking off his duct tape, Tony punches him in the gut and takes Amos’ gun and points it at him. Tony calls him gullible and the gun jams and then Amos takes out his knife and kills Tony.