Paco, a Sevillian living in Paris who works as a music hall singer, receives news of the death of his uncle named him heir to his fortune. The only condition imposed is to pass a test that is to fight in one of the main squares in Spain. If the attempt fails, the estate would pass to her sister full. From here, Paco will have to wake up if he want to show their courage and take part in a bullfight.

A thief steals a Jewel in France and travels to Barcelona to try to sell it. Both the Police and a former associate try to catch him.