Praetorian
Simon Scarrow
 The book starts with Macro and Cato spending their days at an inn in Rome awaiting further orders from the emperor's secretary, Narcissus. Narcissus finally arrives and orders the duo to go undercover in the Praetorian guard to uncover a plot to assassinate the emperor. Macro and Cato then join the Praetorian guard under different names and try to uncover the plot. During their operation they face their old foe, Vittelius. They succeed in saving the emperor on more than one occasion. In the climax it's hinted that they will go back to Britain to help in the invasion there.