In the middle of the night at the Museum of Volterra, young archeologist Fabrizio Castellani is immersed in his work – research into the famous Etruscan statue known as 'The Night Shadow'. Completely engrossed, he is startled by the phone ringing. An icy female voice warns him to abandon his work at once. A series of gruesome killings shortly follow, throwing the people of Volterra into a panic...