Emperor Claudius is in danger. His personal protectors, the Praetorian Guard have been infiltrated by traitors. Summoned to Rome, Macro and Cato are furnished with new identities and placed, undercover, in the Guard to uncover the conspirators' plot. But as they move ever closer to the mastermind, they realise all is not as it seems. The central characters of Centurion Macro and Prefect Cato from the toughest Legion in the Roman world are once again at the heart of this latest novel, in paperback, from the bestselling Simon Scarrow.