Filming for season 14 of the French television series Léo Mattéi, brigade des mineurs has officially started, as announced by Jean-Luc Reichmann, who portrays the lead character. The series is set to air in early 2027 on TF1, with some details already shared by the network in a press release. This upcoming season will follow three investigations centered around adult characters who use children to cope with their emotional pain, often without realizing the impact of their actions. TF1 has released short summaries for the episodes. In "Le Refuge des Fidèles," a dog leads Mattéi to the body of a teenager, uncovering a secret hidden in a refuge. "Petit frère" explores a mother’s desperate attempt to regain custody of her son and an educator who channels his pain into revenge. "L’Enfant de Personne" follows the disappearance of a boy who is overlooked by the administration, protected by a neighborhood and a mother who believes the police cannot help them. In season 14, Reichmann’s character will reunite with his deputy, Justine (Louvia Bachelier), Commissioner Trimoulin (Vincent Desagnat), and Randal (Gwendal Marimoutou). Mattéi will also take on the role of stepfather to Léon (Kaïs), even as his work continues to be intense. A subplot involves an animator at Léon's daycare who abuses children under the guise of play, and Mattéi is determined to stop the perpetrator. The series will include special guest appearances from well-known figures in French television. These include Sara Mortensen from Astrid et Raphaëlle, Louise Monot and Kévin Levy from Demain nous appartient, Naïma Rodric from Un si grand soleil, Kamel Belghazi and Blandine Bellavoir from Les Petits meurtres d'Agatha Christie, and Laëtitia Milot and Frédérique Bel, one of the stars of the film series Qu'est-ce qu'on a fait au Bon Dieu ?.