A 17 year old girl was found defenestree from home for young offenders. The knife wound adorning her abdomen is unequivocal: she was murdered. Falco Knight and discover a neighborhood on the brink of explosion. Two camps clash. On one side the home and its occupants, led by its director. On the other neighbors, guided by the owner of the bar opposite, convinced that all problems come from the corner of the girls. While the first suspicion falls on the home and the past of ex-offenders, the investigation quickly focuses on a personal vendetta ... related to the accidental death of a young man in the neighborhood, a month earlier. The problem for the two officers will then discover the truth without triggering a riot that may end in lynching.