London, 1866. José Rodríguez Losada is forced, time and again, to flee from his past. After leaving the family home as a child, he was forced for political reasons to go into exile from the absolutist Spain of Fernando VII. Now he lives in London, a more advanced city where he sees a more hopeful future. Skillful like few others and always enthusiastic, he must finish an urgent task: to repair Big Ben, the most famous clock in the world. But no one can escape his past and, through the London fog, a shadow watches him to end his life. And, meanwhile, José only lives and works for his dream: building a watch with a revolutionary mechanism. Will José manage to overcome all the dangers that surround him and achieve his dream? History says yes, since his dream will be known as The Puerta del Sol Clock. But how will he achieve it?