Agilulfo is a righteous, perfectionist, faithful and pious knight with only one shortcoming: he doesn't exist. Inside his empty armor is an echoing voice that reverberates through the metal. Nevertheless, he serves the army of a Christian king out of goodwill and faith in the holy cause.

Madness and jealousy push a not very attractive young man to plan to kill a friend who, on the contrary, has a lot of luck with women.