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. The victims – all involved in the desecration of an unexplored tomb – have been torn to pieces by a beast of unimaginable size. Fabrizio is in charge of excavating this Etruscan tomb. Fabrizio is joined in his fearless investigation of the past by Francesca Dionisi, a vivacious young researcher, and foremost by Lieutenant Reggiani, a brilliant carabinieri officer assigned to the case....