Excingus shrugged again.
‘As to what’s inside the place, I have no idea. For all I know, he’s employed Flamma the Great himself as a live-in bodyguard. All I can tell you is that once Dorso’s done guarding the imperial palaces, he takes enough time to wash and change into his off-duty uniform, and then walks down the Vicus Patricius to a little place he either rents or owns — the latter, I suppose, given all the money he must have made over the last few years — buys himself and the two guardsmen who escort him everywhere a hot meal from a nearby tavern, and disappears into the house. He doesn’t come out until early the next morning, when he walks back up the hill to the praetorian fortress and goes back on duty. And as to how I know this? Just for once, given the difficult nature of our relationship, I’ll give up one of my methods if it will help to persuade you of the provenance of my information. I used a gang of petty thieves and pickpockets, men I pay handsomely enough to take time away from their profession when the occasion demands their particular street skills, to tail Centurion Dorso, discreetly mind you, for the last six nights. Given that the praetorians rotate the assignment of their cohorts once every two weeks, to give the men on night duty time to adapt properly to the change of their sleeping hours, I can see no reason for him not to repeat the same routine this evening. He couldn’t be any more accommodating in his predictability if he tried.’
‘And you have no idea what it is that he has in there?’
The informant shook his head at Marcus.
‘As I said, I’m not entirely sure. My people can track him from one place to another easily enough, but once he’s inside the house he’s out of their view. We can all speculate, and my guess would be that he goes there to gloat over the highlights of his collection, but that’s all my opinion is — speculation.’
‘Why do we need to break into this place of his? This man has a reputation as a collector of weapons, so why don’t we just put word out that we’ve got trophies to sell from the recent campaign in Britannia?’
Excingus smiled at the young centurion, unable to keep a patronising edge from his voice.
‘If only it were that simple. If you still had that rather interesting sword you captured in Germania Inferior, for example …’ He smiled at Marcus’s narrowed eyes. ‘Come now, Centurion, soldiers will talk. Yes, if you were still in possession of the “Leopard Sword” then you might have a sufficiently juicy worm to put on the hook, but a few old bits of rusty metal that you took from a tribe that no one’s ever heard of? This man’s a serious collector, or so it’s rumoured, with weapons and other items that span the entire history of Rome and going as far back as the conquest of the Etruscans. He’s even rumoured to be in possession of a sword which is supposed to be the one that One Eyed Horatius used to hold the bridge over the Tiber almost seven hundred years ago, and the gods alone know what sort of price that would command if it were to come on to the market.’
‘No wonder he’s so happy to participate in the murder of prominent members of society. There must be heirlooms in their houses the likes of which otherwise never see the light of day. So, how do you propose that we bring this praetorian to some kind of justice?’
Excingus raised a jaundiced eyebrow at the tribune.
‘How do I propose? I don’t intend to propose anything, Tribune. All I’m going to do is tell you where and when I expect you’ll be able to get to the man. How you go about it thereafter is entirely up to you. And now, gentlemen, as far as I’m concerned my part in your scheming against Centurion Dorso is at an end. Do I need an escort back to the main gate, or shall I find my own way?’
‘So, now you know the effects of distance on your visibility when you’re following a man, let’s consider how that works in practice, shall we?’
The detachment had gathered around Qadir at his command, and were sitting in a semi-circle around him while the Hamian centurion looked around at them, assessing how closely they were following his words.
‘Imagine that we are following a single man through the city. Our task is to keep him in sight while he makes his way to wherever it is he is heading and …’
He paused and looked about him with a significant glance, raising an eyebrow in silent question. One of the brighter soldiers answered, summoning his courage to speak directly to the officer.
‘To make sure that he don’t see us, Centurion?’
Qadir nodded encouragingly.
‘Exactly. For if he does, our careful pursuit will be over in a moment. Did anyone here perhaps play the game when they were children?’
The soldiers looked at each other blankly, and when Sanga spoke it was with a wry grin.
‘Not really, Centurion. We was all more likely playing the “trying to get it up the locals girls” game.’
Qadir nodded, sharing his man’s smile.
‘Very well, allow me to share some small part of what I learned before I left my home and travelled all the way to your cold, damp and barbaric province. We are following a man — let us call him “the mark” — through the city. How far back from him should we be?’
‘Three blocks, Centurion.’
Qadir looked at the man who had answered.
‘Are you sure?’
The soldier looked puzzled.
‘Didn’t you just show us how far back we have to be to avoid being noticed, sir?’
The Hamian nodded.
‘I did. But consider, what will be the effect if our man turns a corner to the left or right? You will be three blocks back, and will not know whether he plans to turn another corner at the next opportunity. By the time you reach the point where he turned, he might well be out of sight. So what must you do?’
The soldier thought briefly.
‘Run?’
‘Yes, you must run, and hope that he is still visible when you reach the corner in question. But then if the mark has any suspicion that he’s acquired a following, might he not choose to turn back on himself and look around that corner a moment later? And if he sees you running towards him then his suspicions will obviously be confirmed. Not only will he make a point of running himself, and turning two or three corners to throw you off his scent, but he will also be looking out for you whenever he is on the street. This will not be a good outcome.’
He looked around him for a moment before chuckling softly at their downcast faces.
‘But this does not have to be the case. The task of following the mark is much easier for one or at the most two men, and sometimes two are better than one since they can talk to each other. After all, what could appear more natural than two friends having a lively conversation when the mark takes that quick look behind him? So, one or two men follow the mark at a distance of between a block and two blocks behind, and the other men hang further back, two groups of two or three on either side of the road.’
He looked round the men with a faint smile.
‘So, let’s try that question again. The mark feels suspicious about those two men behind him, so he chooses to make a sharp right turn. You have no need to run, since you have men in support of you, but what do you do? After all, he’s suspicious of you already, so he has an eye open for anyone trying to follow him, and you were close enough for him to register the colour of your hair, the shade of your tunic and so on. And if he sees you again, still following him even though he has just turned two or three corners to evade just such an attempt to track him, he’s likely to react just as badly as if he saw you running. So …?’
‘So we need to get the blokes that are hanging back to move up sharpish and take up the follow.’
Qadir applauded softly.
‘Good, Sanga — but how shall we do that? The mark will, after all, be listening carefully for the sound of shouting, anything out of the ordinary.’
Saratos frowned up at him, clearly considering the question, then smiled quietly to himself.