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.
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.
