The Rome of Emperor Claudius is suffocating in the grip of hunger - grain supplies have been interrupted. Hunger riots are tearing the capital apart. The emperor himself almost falls into the clutches of the rebels. A secret organization of Republicans is plotting to overthrow Claudius. The threads of the conspiracy lead to the highest command of the Imperial Guards - the Praetorians. It seems that the emperor is driven into a corner and there is nowhere to wait for salvation. There was only one hope left - in old fighting friends Cato and Macron. The prefect and the option must infiltrate the ranks of the guards as ordinary praetorians, uncover the conspiracy, deal with the supply of grain to the Eternal City and save the emperor. The task is just for army veterans.