An argument explodes in front of the Saint-Eustache Church between two homeless people who accuse each other of having stolen the money from the collection. They are separated by Maurice Bossart, one of the sacristans. Alerted by the noise, Father Roche also intervenes to calm the situation. Later that evening, one of the two homeless, Thomas, returns to the church, grabs a broken bottle and kills Bossart ...

Since the death of her husband, the very wealthy Madame de Gersant has lived alone. Alex, his only son, is trying to get off drugs with his pregnant girlfriend Nina. But fate hangs over the couple when Nina is killed and he is the main suspect ...