January 1917—With St. Petersburg on the brink of revolution, Sandro Ruzsky, the city’s chief police investigator, returns from exile in Siberia only to be assigned a grisly case: the bodies of a young couple found on the ice of the frozen River Neva, just outside the Tsar’s Winter Palace. Ruzsky’s investigation leads him dangerously close to the royal family and to the woman he loves, and he finds himself confronting both a ruthless killer and the ghosts of his past as he fights desperately to save all that he cares for.