Maxime is a hardened bachelor who takes advantage of his freedom and assumes to live without ties or children. He has finally agreed to help a couple of friends who are trying to have a child by artificial insemination, by donating sperm to speed up the procedure. His life changes the day a rather invasive brother arrives at his home, accompanied by a rather hairy ferret, and when, in the middle of a torrid evening in gallant company, this ferret bites his private parts, making him permanently sterile. Realizing that he will never be able to have children, Maxime tries to get his gift back, only to learn that it has already been used for Lisa Barrot, a famous and seductive sports journalist. Aware that she will be the mother of his only child, he decides to do everything possible to meet her and get to know her.

Police Commander Louise Chaland is investigating the murder of a controversial sculptor with the help of her son Sylvain, who has become a priest. The body was discovered alongside one of his works, which has been daubed with Latin inscriptions. They soon establish a link with the disappearance of a relic of Saint Martin, the patron saint of the city of Tours. Their investigation leads them to a shelter for the needy, run by François Delcourt and his daughter, who was in love with the murdered artist. Clues start to reveal the disturbing fascination some inhabitants of Tours have with the missing relic. Louise and Sylvain will discover the rich historical and religious heritage of the city as the secular mother and pious son come to some sort of a reconciliation.

A ski resort town struggles to become the top tourism spot.