Following the birth of Léo, Morgane and her four children moved in with Karadec, with whom she is now a co-parent and roommate, in addition to being a colleague! And after a parental leave consisting of sleepless nights and camping in the living room, it's back to work for our two heroes. But, between fatigue, the eternal custody problems and a mysterious crime that quickly turns into a nervous breakdown... This 24-hour day could well be the longest of their lives!