Mar and Álex are brothers. And, to their disgust, there is only 364 days between them, which means they have to share more things than they want: school, class, friends, and a birthmark on their left forearms, that they have a pile of stories about. If you came across them, they wouldn't seem anything special at all, but their secret is that they never turn their backs on a good mystery. What are they up to now? In addition to sorting out their everyday affairs (homework, friends, dreams, boys and good looking girls, relations… like anyone else), the Morata brothers are trying to solve the mystery of some songs that have disappeared. Captain Bañuelos wrote them before his death for his daughter Olivia Valdés, who is —as you know—the most famous pop singer today. She and Biel, her mysterious manager, are desperately trying to find the songs. But it seems that someone is trying to get to them first…