Set amid the eerie canals of Venice, Captain Katerina "Kat" Tapo dives into her first murder case when a woman's body, dressed in priestly robes and bearing a distinctive tattoo, floats ashore. As Kat pursues the truth, her investigation reveals a sinister web of wartime secrets, organized crime, Vatican corruption, and shadowy intelligence ties. Joined by Lieutenant Holly Boland, they traverse Venice’s labyrinthine streets—and its digital twin, Carnivia.com family. The deeper they dig, the more dangerous their mission becomes, exposing secrets that may rewrite history itself.