In the darkest hours of the night at the Museum of Volterra, young archaeologist Fabrizio Castellani is immersed in his work. He has discovered that the famous Etruscan statue known as "the shade of twilight" contains a mysterious object. He is interrupted by a phone call from an icy female voice, warning him to abandon his research. A series of gruesome killings follow. The victims, all involved in the desecration of an unexplored tomb, seem to be have been torn to pieces by a beast of unimaginable size. Meanwhile, as Fabrizio excavates the Etruscan tomb he discovers something extraordinary. Can he unravel these secrets without being sucked into the spiral of violence himself?