What does Barack Obama have in common with Lula, Chavez or Evo Morales? Change, renewal. And it was with this spirit that a group of young people landed in Cuba 50 years ago and overthrew a fascist government headed by Fulgencio Batista. In 2009, Cuba celebrates 50 years of its revolution and Fidel is no longer in charge of the island. At a time when the world is trying to project what the future of this country (and its own) will be, the documentary Letter to the Future reveals 5 years of recordings, made through the eyes of Renato Martins and Lula Carvalho, in search of the deepest roots of the Island, of everything that, beyond the political reading, defines Cuba as a nation and gives identity to its people. Different from the traditional historical reading of the Cuban revolution, Letter to the Future follows the life of a typical Cuban family, crossing 4 generations. PIPO, the revolutionary great-grandfather, who dies during these years - at the same time that Fidel leaves power -, is the father of MIRIAN, who sees his revolutionary feelings put to the test by the reality of his family's life on the island, as well as the escape of his son JULIO to Miami, via Mexico. JULIO is determined to exile himself in Miami and not return to Cuba. YULME, MIRIAN's daughter, is part of a generation that seeks a new dialogue with its own country, trying to create the ideal place for her children Diego and Cristina to live. Diego, 10 years old, surprises with his knowledge of the island's history and his revolutionary feeling, very similar to his great-grandfather. He is the one who begins to write the Letter to the Future.