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Ottavio Camaldoli is a professor of Latin and Greek. An honest and gentleman, he is considered a "fool" by everyone around him. But what would happen if this defenseless man, a victim of petty daily abuses in his social life, at work, and even at home, were to receive another man's heart transplant? Especially if this other man, the donor, were a brutal criminal with the sinister nickname of "O Barbiere" (The Barber)? Would Ottavio Camaldoli, after inheriting the heart, automatically become a criminal? Science tells us that these are just silly, ancient beliefs. But what if Donna Carmela, the Barber's ruthless mother, were convinced that her son is still alive thanks to the heart now beating in the professor's chest?