Antonio is a lonely man who works as a driver of luxury cars. Outside of his work, he spends his time reading science fiction novels, and, especially by night, driving through the streets of the city. One night he meets Maria, a lonely woman, and her daughter Lisa. He manages to enter in their life, and starts to take care of them. He discovers that Maria owes a lot of money to an usurer, and starts to pay her debts, but without letting her know of this. He dedicates with total abnegation to Maria, up to the point of losing his job, but she seems to remain indifferent to his love. Until...