A young couple, Pippa and Thomas, move into their first apartment together in
Montreal. They soon realize they can see directly into the apartment across the street, where a man with a professional studio is photographing a woman. Pippa and Thomas watch the couple have sex. They jokingly give their neighbors the pseudonyms Margot and Brent. Pippa, who works as a trainee optometrist at L'Optique, receives a
bird feeder from her boss as a housewarming gift. She buys a pair of binoculars so she and Thomas can watch the couple. They often see Brent having sex with models while Margot is out. Growing bored in her relationship with Thomas, Pippa begins to lust after Brent. Pippa expresses interest in knowing what the neighbors are saying and learns that Thomas knows a way to listen in on another room using a
laser pointer; the process requires a reflective surface to send the laser beam back to them. When Brent and Margot throw a Halloween costume party in their apartment, Pippa and Thomas sneak in, posing as guests. Pippa plants a mirror in the apartment to allow her and Thomas to listen in on their conversations. They are unsettled to hear Margot confront Brent about his adultery; Brent denies it, assaults Margot, and rebukes her for her suspicions. The next day, "Margot", whose real name is Julia, visits L'Optique, where she receives an eye exam from Pippa and orders a new set of glasses recommended by her. Julia invites Pippa to hang out. Pippa wants to warn Julia about "Brent's" adultery, but Thomas insists that she stop spying on them. Later, Pippa and Julia meet at a spa; Julia reveals that her husband is named Sebastian, or Seb, and is a well-known photographer. Pippa observes Seb having a threesome and throwing a condom away afterward. She later discovers how to access Julia's wireless printer, which she uses to announce Seb's infidelity, mentioning the condom as proof. Thomas angrily confronts Pippa about being so invested in Julia's and Seb's lives. The next morning, Pippa apologizes to Thomas and promises to stop watching the neighbors. Then they see Seb discover Julia's body in the bathroom after she seemingly slit her own throat. Thomas blames Pippa for Julia's death, breaks up with her, and leaves. Though heartbroken, Pippa continues to watch Seb, and one evening follows him to a bar. Seb sits by Pippa and they talk. He persuades her to pose nude for him at his apartment and they have passionate sex. Upon returning home to reconcile, Thomas consumes part of a drink in the refrigerator and pours the rest into the bird feeder. He sees Pippa having sex with Seb across the street. The next morning, Pippa finds Thomas dead in their apartment, having apparently hanged himself. Pippa and her friend Ari attend Seb's exhibition, which turns out to be a collaboration with Julia, who is alive. Pippa and Thomas are revealed to be the subjects of the exhibition. Seb and Julia divulge that they own the apartment rented by Pippa and Thomas (whose lease included a clause saying that they consented to be photographed) and knew they were being watched. Pippa storms off, finds Seb's studio above her apartment, and trashes it. As she moves out, she notices dead birds on a grate below her bird feeder. After an interview promoting their exhibition, Seb and Julia return home to find a congratulatory bottle of wine by their door. As they drink it, Pippa sends a message to the printer saying she knows they killed Thomas. They see her spying on them from the rooftop and chase her into L'Optique, where she tells them she deduced that, while she was having sex with Seb, Julia drugged Thomas's drink and staged his suicide. Pippa also reveals that she spiked their wine, causing Julia and Seb to faint. Pippa places the two under a
LASIK machine and burns their corneas. Two men move into Pippa and Thomas's former apartment. They observe Seb and Julia, both of whom are now blind and unaware of being watched. Pippa watches Seb and Julia from the rooftop before leaving her binoculars behind. ==Cast==