A mezzanotte va la ronda del piacere

Processata per omicidio preterintenzionale del coniuge Gino (G. Giannini), precipitato dopo una lite coniugale in un collettore di depuramento, la proletaria Tina Candela (M. Vitti) fa la propria autodifesa, ascoltata con interesse da una giurata popolare (C. Cardinale), moglie in un ingegnere intrallazzatore (V. Gassman)...

Tina is on trial for the murder of her lover, Gino. The violent nature of their relationship, revealed in the trial, seems to make obvious that she accidentally killed him during a fight. The lone female jury member compares her life to Tina's and, believing her to be innocent, sets out on her own to find a missing witness that can prove Tina's innocence.