A high-ranking officer of the Italian Communist Party discovers he is a vampire and leaves his position, retreating to the abandoned residence of his deceased grandfather. There he finds the diary of his grandfather that gives him the answers he needs.

In Naples, Professor Bellavista is a retired man, passionate about the philosophy and thought of Ancient Greece. Every day, in his luxurious apartment, he teaches his lessons of life to the poor-nothing (his friends), who are dazzled by his reasoning. One day, however, the quiet life of the building of Bellavista will be disturbed by the arrival of a director of Milan. Between Naples and Milan there contrast, because the Neapolitans are accustomed to enjoy a quiet life, always based on the "philosophy of pleasure and delay", while the northern Italians are very strict and punctual.

Vincenzo, a 30 years old apathetic and lazy man who still lives with his mother, has no job and no desire to improve. He meets Anna and fell in love with her but to keep the relationship alive he has to learn to accept more responsibility.