A real dive into the heart of 17th-century Paris, this story takes us into the daily life of Vincent de Paul, a devoted churchman, in search of the truth. Accompanied by young Antoine, Father Vincent travels the neighborhoods of the city, pleading his case with the richest of the rich and helping the poor. He takes in Manon, a 15-year-old orphan who is a victim of prostitution. Manon's story is connected to the disappearance of Jérôme, another person protected by the priest. Father Vincent takes it upon himself to shed some light on a cruel assassination and to reveal the truth behind a series of mysteries.