On a sunny morning in Madrid, a mathematics teacher named Miguel and his lover, a young and beautiful woman named Cristina, find themselves caught in a fatal accident due to a moment of carelessness. While driving in their car, a cyclist suddenly appears, and in a tragic instant, the vehicle hits him. Instead of facing the consequences of the accident, Miguel, paralyzed by fear and guilt, persuades Cristina to leave the scene, abandoning the seriously injured cyclist on the road.
The story complicates when a police detective begins to investigate the accident, adding tension and paranoia to Miguel's life. As the two lovers try to keep their secret at all costs, the shadows of their guilt loom over them, causing their relationship to crumble. Memories of the cyclist and the pressure from their social environment start to wear down the fragile emotional stability of both, forcing them to confront not only the weight of their actions but also the truths about their own morality.
Through a narrative of psychological suspense that reflects the anguish and moral dilemma of its protagonists, the film explores themes such as guilt, love, and the drastic decisions people make to protect themselves, blurring the line between right and wrong in a context of social crisis.