Prologue. Part One. Part Two. Part Three. Part Four. 10 August 1257. 12 August 1257

So. We were too late to escape Masyaf before the Mongols arrived. Indeed, they have arrived. As a result we leave for Constantinople in a matter of hours and I’m scribbling these words as our possessions are removed by helpers to be loaded on to the carts. And if Maffeo thinks that the sharp looks he insists on throwing my way will be enough to make me lay down my quill and lend a hand then he is mistaken. I know now that these words will be of vital importance to future Assassins. They must be written down at once.

It’s a small skirmishing party, or so we’re told. But the main force is not far away. In the meantime the skirmishing party seems to want to make a name for itself and has been launching small but fierce attacks, scaling the walls of the village and fighting on the ramparts before retreating. I know little of warfare, thank goodness, but it occurs to me that these short assaults may be a way of gauging our strength, or lack of it. And I wonder if the Master ever regrets his decision to weaken the citadel by disbanding the Assassins. Just two short years ago no mere skirmishing party would have come within ten paces of the castle before falling to the Assassin archers, or beneath the blades of the defenders.

When he had wrested control of the Order from Abbas, Altaï r’s first task was to send for his journals: the Master’s work was to be a totemic force in the rebuilding of the Order, essential for providing the foundations to stop the rot at Masyaf. Under Abbas’s corrupt reign they had had none of the skills or training of old: the Brotherhood had been Assassin in name only. Altaï r’s first task was to restore the discipline that had been lost: once again the training yard echoed with the ring of steel and the shouts and curses of the instructors. No Mongol would have dared a skirmish then.

But just as the Brotherhood had been restored in name and reputation, Altaï r decided that the base at Masyaf should no longer exist and removed the Assassin crest from the flagpole. His vision for the Order was that the Assassins should go out into the world, he said. They should operate among the people, not above them. Altaï r’s son Darim arrived home in Masyaf to find just a few Assassins left, most of whom were occupied in the construction of the Master’s library. When it was complete, Darim was dispatched to Constantinople to locate my brother and me.

Which brings us to our entrance into the story, some eighty years after it began.

‘But it is not over yet, I feel, ’ Maffeo said. He stood waiting for me. We were due to see the Master in the main courtyard. For what was surely the last time, we wound our way through the fortress to the courtyard, led by Altaï r’s faithful steward, Mukhlis.

As we arrived I thought, What sights it has seen, this courtyard. Here was where Altaï r first saw Abbas, standing in the dead of night, pining for his stricken father. Here was where the two had fought and become enemies; where Altaï r had been shamed in front of the Order by Al Mualim; where Maria had died, Abbas, too.

None of this would have been lost on Altaï r, who had gathered most of the Assassins to hear what he had to say. Darim was among them, with his bow, the young Malik, too, and Mukhlis, who took his place beside the Master on the dais outside his tower. Nerves fluttered like moths in my stomach and I found myself taking short, jagged breaths to try to control them, finding the background noise of battle disconcerting. The Mongols, it seemed, had chosen this moment to launch another of their attacks on the castle, perhaps aware that its defences were temporarily depleted.

‘Brothers, ’ said Altaï r, standing before us, ‘our time together was brief, I know. But I have faith that this codex will answer any questions you have yet to ask. ’

I took it and turned it over in my hands, in awe of it. It contained the Master’s most important thoughts, distilled from decades of studying the Apple.

‘Altaï r, ’ I said, barely able to form words, ‘this gift is … invaluable. Grazie. ’

At a sign from Altair, Mukhlis stepped forward with a small bag that he handed to the Master.

‘Where will you go next? ’ asked Altaï r.

‘To Constantinople for a time. We can establish a guild there before returning to Venice. ’

He chuckled. ‘Your son Marco will be eager to hear his father’s wild stories. ’

‘He is a little young for such tales. But one day soon, sì . ’ I grinned.

He passed the bag to me and I felt several heavy objects inside it shift.

‘A last favour, Niccolò. Take these with you, and guard them well. Hide them if you must. ’

I raised my eyebrows, implicitly asking his permission to open the bag and he nodded. I peered inside, then reached in and removed a stone, one of five: like the others it had a hole in its centre. ‘Artefacts? ’ I asked. I wondered if these were the artefacts he had found during his exile at Alamut.

‘Of a kind, ’ said the Master. ‘They are keys, each one imbued with a message. ’

‘A message for whom? ’

‘I wish I knew, ’ said Altaï r.

An Assassin came hurrying into the courtyard and spoke to Darim, who moved forward. ‘Father. A vanguard of Mongols has broken through. The village is overrun. ’

Altaï r nodded. ‘Niccolò, Maffeo. My son will escort you through the worst of the fighting. Once you reach the valley, follow its course until you find a small village. Your horses and provisions are waiting for you there. Be safe, and stay alert. ’

‘Likewise, Master. Take care of yourself. ’

He smiled. ‘I’ll consider it. ’

And with that the Master was gone, already barking orders to the Assassins. I wondered if I would ever see him again as I shouldered the bag of strange stones and held the priceless codex tight. What I remember then is an impression of bodies, of shouting, of the ringing of steel, as we were hurried to a residence, and there I huddled in a corner to scribble these words, even as the battle raged outside – but now I shall have to go. I can only pray that we will escape with our lives.

Somehow I think we will. I have faith in the Assassins. I only hope that I am worthy of Altair’s faith. In that respect, only time will tell.