The Terrorist (1963)

Venice, winter of 1943. The Italian Resistance is preparing an attack on the Kommandantur headquarters. A man, nicknamed The Engineer, plays a central part in this plan. The attack takes place and although it is deadly, its main objective (the Nazi commander) escapes unscathed. The next day, the Axis authorities respond by menacing to kill a number of prisoners if The Engineer is not brought to them.