The moon illuminates silver the room. Fran is sixteen and wants to escape from those walls, as a mother of him who has never dealt with him. In the small suburb of Madrid in which he grew up his days with his friend Eduardo and his sister Tania, whose he is lost in love. The two boys could no longer be different from him. Children of a wealthy family, attend schools and more exclusive environments. Yet, he feels that behind that golden appearance there is something. When Tania suddenly bridges a man from the dark past, doubts turn into certainties. Eduardo begins to work for brother-in-law and everything changes. And more and more lonely and nothing seems to interest him. Fran needs to know how things are really. But the answer has never been so far away. Because Eduardo delivers a mysterious key to guard asking him not to talk to anyone. And a few days later he disappears. From that moment Fran has only one goal: he must know what happened. You must find out what the key opens. She's friend trusted him. The research leads him to reveal unexpected secrets. She leads him to a road where he is increasingly difficult to find traces of Eduardo. Because there are indications that they must remain hidden and sometimes silence says much more than many words.