Trieste, our days. Leonardo Cagliostro is a police commissioner with great investigative talent, but impatient with the rules, married to Anna, a magistrate with a certain and determined character. One evening, during a meeting with an informant, Cagliostro is mysteriously killed. But he was given a second chance: Cagliostro returns in his unusual ghostly clothes to investigate his death and save his wife's life, seriously endangered.