It is spring in the year 118, and Hadrian has been emperor of Rome for less than a year. After his long and reluctant investigation of the murders of a handful of local prostitutes, Gaius Petreius Ruso needs to get out of town. With that in mind, he has volunteered for a posting with the army in the far reaches of Britannia-a calmer place for a tired man.But the edge of the Roman Empire is a volatile place; the independent tribes of the North dwell...