Three men on duty spend Christmas Eve at the police station in the 13th arrondissement of Paris in Croulebarbe. They talk about everything that is connected with such an extraordinary service, and all firmly believe that in the silent and holy night there will be peace from crime. He believes that the blaring of the police alarm that evening can only be caused by a lonely drunk who decides to share the oppressive loneliness of Christmas night with the police officers on duty. At that moment, none of them have any idea that the seven crosses marking the places on the map of Paris from which the police alarms sounded that night will be the key to uncovering a serious crime.
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