When a brutal killer is on the loose in Venice, ex-priest Tom Shaman finds himself catapulted headlong into a series of ritualistic killings unlike anything Venice has ever seen. Uncovering a deadly secret at the heart of the city's past - a priceless three-pieced Etruscan mosaic known as The Gates of Hell - Shaman teams up with investigator Valentina Morassi to dig deep into the shadows of Venice's darkest history - and find the killer before he claims his next victim ...