The script, written by André Téchiné and Régis de Martrin-Donos, centers on Lucie, a retiring agent of the technical and scientific police. The arrival of a young couple (the parents of a little girl) in his neighborhood disturbs his lonely daily life. When she falls in love with her new neighbor, she discovers that her father, Yann, is an anti-police activist with a heavy criminal record. The moral conflict between Lucie's professional conscience and her desire to help this family will shake her certainties...