Seventeen-year-old Kale Brecht and his father spend an idyllic day fishing. While Kale drives them home, they get into a car accident that kills his father. One year later, Kale has become a troubled, sullen, withdrawn outcast, wracked with guilt and grief over his father's death. During Spanish class, Señor Gutierrez reprimands Kale for poor behavior and mentions Kale's father insensitively, inciting Kale to attack him. A sympathetic judge sentences Kale to three months'
house arrest and orders him to wear an
ankle monitor and a
proximity sensor. At the Brecht house, Detective Parker explains how the ankle monitor functions. The overseeing police officer is Señor Gutierrez's cousin. Kale spends his confinement watching television and playing video games while neglecting household chores. His frustrated mother, Julie, cancels his
Xbox Live and
iTunes subscription and cuts his TV cord. Bored, Kale observes his neighborhood with binoculars. His neighbors include the solitary Robert Turner and Ashley Carlson, an attractive teenage girl whose family has recently moved in next door. When Kale accidentally trips his proximity sensor while chasing pranking neighborhood boys, the police quickly arrive and Officer Gutierrez roughly handcuffs Kale. After receiving a warning, Kale sets up a marked perimeter zone and is careful to stay inside. Late one night, Kale grows suspicious when Turner returns home in his classic
Ford Mustang with a dented fender. The vehicle matches the description of a car mentioned in a newsflash about a
serial killer at large. Kale befriends Ashley and, together with Kale's best friend, Ronnie, they begin spying on Turner. When Turner has a female guest, they see her frantically running from him inside the house; however, she appears to drive away later. Kale becomes jealous when he sees Ashley flirting with popular classmates at her pool party. When he blasts disruptive non-party-related music at them, Ashley arrives and angrily confronts him. He reveals his romantic attraction to her, and they kiss. The following day, Kale asks Ashley to follow Turner to the supermarket while Ronnie obtains the code to Turner's garage door controller. Turner intercepts Ashley in the parking lot and sternly warns her to stay away. Shaken, Ashley stops helping with Kale's investigation. Ronnie realizes he left his phone in Turner's car and breaks into his garage to retrieve it as Kale watches him from a distance. Ronnie gets trapped when the garage door closes. When Kale tries to rescue him, he trips his ankle monitor. The police arrive and search the garage, as Kale accuses Turner of murder. However, they only find a bag containing a roadkill deer. Julie goes to Turner's house and convinces him not to press charges against Kale. Ronnie, who escaped Turner's house, shows Kale the video he shot while inside. Zooming in on a single frame, Kale sees what looks like a woman's corpse through a heat vent grate. Meanwhile, Turner incapacitates and binds Julie. Turner enters the Brecht house and knocks out Ronnie with a bat. After binding and gagging Kale, he reveals he will frame Kale for murdering Ronnie and Julie and then make it appear that he committed suicide. However, Ashley arrives, distracting Turner and allowing Kale to club him in the face. Ashley unties Kale's hands and mouth. They jump from the bedroom window into her pool, setting off the ankle monitor and notifying the police. Kale enters Turner's house and frantically searches for Julie. While there, he finds previous victims' corpses. When Officer Gutierrez arrives, Turner kills him. Kale finds his mother bound and gagged in the cellar. Turner appears, slashes Kale in the back and pins him to a wall. Before Turner can kill Kale, Julie stabs his leg with a screwdriver, allowing Kale to impale Turner with gardening shears. Following the harrowing ordeal, Kale's ankle bracelet is removed early for good behavior. Kale exacts revenge on the pranking neighborhood boys before kissing Ashley as Ronnie playfully videotapes them. ==Cast==