Silvia doesn't fit in at home or at school. She does the impossible in order to have a normal life, but she's not happy. There's something missing in her life, but she doesn't know what. In contrast, Rubén feels loved by his adoptive family, but he can't forget the twin sister from whom he was separated as a baby. So he decides to travel to Madrid to look for her. But his search won't be as straightforward as he imagined. When he reaches the capital, he finds a puzzle made up of pieces that are difficult to fit together.