A soldier from the 15th century, a university student from the 19th century and a nurse from the present join the secret 'Department of Time', a secret department within the Spanish government with the ability to travel through time. Their mission is prevent changes in history.
Many prisoners convicted of rape, murder and terrorism are released before serving their full sentences. Hours later, one of them is killed. Detectives Mora and Nieto take on the case.
A man is found brutally murdered, presumably by his son Marcos, a teenager with no apparent problems. The tragedy hits the school, with students and teachers wondering what went wrong.
