John leaves for Barcelona in search of Cristina, who two years ago went to the city. On arrival he is hosted in a cousin's house and there he meets Monica that falls madly in love with him. When he finally finds Cristina, things do not happen as he expected, the time and the city have changed her and she is not sure to continue the relationship. Meanwhile, Monica tries unsuccessfully to call the attention of John.

The improvised spy, Jaime Bonet, must go to Barcelona to recover a stolen microfilm which is hidden in a soccer ball.