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.

Fidel, an Asturian miner, after the closure of the mine where he works, decides to walk to Madrid with his family, to ask the king why the Constitution is not met, specifically the article that points out that all the Spanish citizens have the right to have a decent work. Will the king receive him?