They joined the dice game in the mess hall. Some tables and benches had been dragged aside so that the men could gather round the action. The standard bearer oversaw the cast of the dice and the raucous placing of bets between throws. Cato leant close to Macro and cupped a hand to his friend’s ear. ‘I need to drop a message off. Tigellinus may still be at headquarters, if he hasn’t returned to the barracks. Try and find him and keep an eye on him. If he leaves, you follow him. Agreed?’

Macro nodded. ‘Be careful.’

Cato smiled, and then waited until there was a roar of delight and frustration at the latest roll and the winners crowded round those taking the bets to claim their winnings. Using the chaos to cover his exit, Cato slipped out of the hall and fetched his old army cloak that he had worn in Egypt. He had decided that it would be best not to wear a cloak issued from the Praetorian stores if he was to blend in on the streets. When he reached the safe house he wrote a brief note to Septimus explaining his intentions for Centurion Lurco once the century returned to Rome after escorting the Emperor. He placed the waxed tablet in the cavity beneath the floorboards, turned the lamp towards the door as agreed to signal a message, and then left. Back on the street Cato pulled his hood up and headed towards the square where the River of Wine stood. Even though it was late in the morning the streets and alleys were far quieter than usual. The men of the Praetorian Guard and urban cohorts were still patrolling the city and breaking up any gatherings, as well as stopping and questioning anyone acting in such a way as to provoke their suspicion. Cato assumed that most of the Subura’s inhabitants were too nervous to venture out for anything other than food and water.

He was making his way down a dim alley when he saw a figure approaching from the other direction. Like Cato he was wearing his hood up and kept his head bowed. He wore an expensive embroidered tunic beneath the flaps of his cape. There was something about him that sparked a vague sense of recognition in Cato. Something in the way he carried himself as he paced down the alley, the swagger of a fighting man. As they passed, his shoulder caught Cato and he mumbled something that might have been an apology or a warning and continued on his way without breaking his stride.