David Aurphet, Christophe Malavoy a struggling guitar teacher, is invited to give lessons to Viviane Tombsthay, the daughter of a well-to-do couple. The wife, Julia Tombsthay Nicole Garcia, soon begins an affair with him, while Viviane and a neighbor, Edwige Ledieu Anémone, both show an interest in him as well. The situation becomes tangled as feelings collide with secrecy, and the borders between teacher, lover, and pupil blur into a dangerous maze.
Not long after, David is robbed, but a stranger named Daniel Forest Richard Bohringer intervenes, pulling him out of danger. Daniel is blunt about his own profession: he is a contract killer who is currently on a job, and he suggests the robbery could be a ruse aimed at injuring David’s hand—perhaps the work of a jealous husband who wants to end his ability to play guitar. This ominous encounter plants a seed of distrust and fear that will ripple through every choice David makes.
Soon after, an anonymous videotape arrives, seemingly proof of David’s affair. Julia claims she has one too, and the two tapes become a shared weapon in a game of deception. David confides in Edwige about the video, but he keeps Julia’s involvement to himself. The sense that someone is watching grows stronger after he discovers someone has been at his house, prompting him to ask Daniel to stay overnight “just in case.” The quiet tension thickens as the two men navigate a world where trust is scarce and every door could hide a hidden threat.
A visit to Julia’s home intensifies the danger. With her husband away, Julia invites David inside, and after she leaves, Daniel reveals a chilling truth: Julia’s husband, Graham Tombsthay Michel Piccoli, is his intended target. Daniel warns David to keep his distance from Julia for his own safety, but when David refuses to withdraw, Daniel steps in with a calculated measure of protection—a handgun given to David for defense.
The night of reckoning comes when David arrives to find Graham there, apparently bent on eliminating him. In a swift, desperate moment, David shoots Graham to defend himself. Julia’s reaction is cold and immediate: she urges David to leave, and he seeks refuge with Edwige. She plays back the video and reveals a stunning twist: David’s action only injured Graham, who was later killed by Julia, turning the supposed mercy of the rescue into a deadly chain of consequences.
The pressure continues to mount as Daniel resurfaces with threats tied to missing microfilm, turning a personal scandal into a dangerous corporate-like leverage. Facing this final pressure, David makes a decisive move: he kills Daniel and escapes the immediate danger, taking Viviane with him as they vanish from the scene together. In the end, the pair move forward through a world of shifting loyalties, where appearances can be deceptive, and every choice could carry a price.
Throughout the film, the story threads together desire, danger, and double lives, showing how a seemingly simple arrangement—an instructor teaching a girl from a wealthy family—can spiral into a web of passion, secrecy, and violence. The film maintains a cool, clinical gaze on its characters as they navigate a landscape where affection collides with mortality, and where every rumor and every videotape can alter fate in an instant.
