«Maigret relived the sensations of yesteryear: the cold, the stinging in the eyes, the icy tips of the fingers, the aftertaste of coffee. And then, when entering the church, a blast of heat, of dim light; the smell of candles, incense ... ». The last time Maigret visited Saint-Fiacre, the town where he was born, it was to attend the funeral of his father, who worked for thirty years as administrator of the castle of the counts of the region. Now an anonymous letter announces that a crime will be committed during the Mass on All Souls, and the commissioner must return to his origins to avoid it. At the end of the mass a parishioner has died, as had been announced: Maigret, despite having been present and attentive, has seen absolutely nothing that would allow him to know who or who committed the crime. The mythical inspector of the great master of the crime novel will have to resort to his sagacity and psychology to solve this new case that forces him to return to his homeland and threatens his tender childhood memories.