A family is devastated after the mysterious disappearance of Lucas, one of their children. 20 years later, Lucas suddenly reappears. After the initial impact, everybody doubts he is really Lucas. His sister Catalina is the one who feels especially tormented, because she feels very attracted to him. "Lucas's" return causes the Diaz Ayalas' past to be revisited, and it brings about many secrets that will slowly come to light. It is also the beginning of a great love story that seems impossible and must go through many tests before coming to fruition.