Sandra is a reserved thirty-year-old aspiring novelist who is locked into a highly structured, stable life and is on the verge of marrying Marco, a rational and practical orthopedic doctor. Her predictable world is entirely disrupted when she crosses paths with Marco’s charismatic younger brother, Alex, a nineteen-year-old basketball player. An instant, mutual attraction sparks between them, but while Alex is driving her home, they are involved in a devastating car crash that leaves Sandra uninjured but results in the medical amputation of Alex's leg. Plagued by immense guilt and emotional confusion, the wedding is postponed, and Marco decides to bring his recovering brother into their shared apartment. Trapped in a claustrophobic domestic environment, Sandra enters into a highly intense, emotionally charged extramarital affair and forbidden romantic connection with her future brother-in-law, triggering a complex web of domestic infidelity and secret desires under her fiancé's roof.