Directed by Teresa Simone, this Mexican-Spanish erotic psychological thriller explores obsession, infidelity, and the collapse of structural domestic boundaries. The narrative centers on Lucero (Ludwika Paleta), a successful married lawyer who leads a highly privileged, picture-perfect lifestyle alongside her husband, Fernando (José María Yázpik), and their two children. Feeling a profound void beneath the immaculate surface of her life, Lucero falls into a consuming, secret physical affair with Matías (Óscar Casas), the handsome young swimming coach hired by her husband. The situation spirals into deep psychological instability and jealousy when Lucero’s teenage daughter, Viviana (Pilar Pascual), also becomes deeply attracted to the coach, pulling the household into a dangerous emotional triangle.