Byward Tower was a Gordian knot in and of itself, in that it connected the complex’s two most important gates to its most congested corner. But that was only its ground floor. The building consisted of two circular towers bridged together, and was a favorite place to keep important prisoners. It now stood to one side of Daniel and Isaac. To their other side was the enormous, out-thrust bulk of Bell Tower, the southwestern bastion of the inner wall. But Daniel only knew this because he was a scholar who’d looked at old pictures of the place. Much more obvious were the ground-level structures built facing the street: a couple of taverns right at the base of Bell Tower, more sutlers’ shacks, and small houses and apartments heaped and jumbled against and on top of every ledge of stone that afforded purchase.

Anyone coming into such a crowded place would instinctively scan for a way out. The first one that met the eye, as one came in through Byward Gate, was Water Lane-the strip of pavement between inner and outer defenses, along the river side. This view was half-blocked by Bell Tower and its latter-day excrescences, but none the less seemed like the obvious path to choose, for Water Lane was broad. And because it was open to the public during the daytime, it was generally free of clutter.

The other choice was to make a hard left, turning one’s back on the river, and wander off into what looked like a medieval slum, thrown up against the exterior of a Crusader castle by a lot of bustling rabble who were not allowed to come in and mingle with the knights and squires. The spine of it was a single narrow lane. On the left side of that lane ran a series of old casemates, which in soldier-parlance meant fortified galleries, specifically meant to be overrun by invaders, so that defenders, purposely stranded inside of them, could shoot through the windows into the attackers’ backs and turn the ditch into a killing-ground. In new forts, the casemates were burrowed into the ramparts, and protected by earth. In obsolete ones like this, they were built against the inner faces of curtain-walls. The ones on the left side of Mint Street were of that sort. They rose nearly to the height of the outer wall, obscuring it, and making it easy to forget that all of this was built intra muros. Gunpowder had long since made them militarily useless, and they had been remodeled into workshops and barracks for the Mint.

On the right side, packed in tight as they could be, but never rising above a certain level-like mussels along the tide-line-another line of buildings clung to the higher walls of the inner defenses.

From the corner there at Byward, it all looked like the wreckage of a burnt city that had been raked into a stone sluice where it wanted a good rainstorm to quench the flames, beat down the smoke, and wash it away. The rhythmic crashing noises echoing down the length of this dung-choked ghetto provided the only clue that something of an organized nature was going on in there; but this hardly made Mint Street seem more inviting, even when one knew (as Daniel did) that the incessant bashing was the sound of coins being minted by trip-hammers.

In a funny way, he thought, this burning gutter was a sort of counterpart to Fleet Ditch.

Since the Fleet was full of earth and water, and Mint Street full of fire and air, this was not an insight that ever would have come to Daniel’s mind, if not for the fact that, just a few scant minutes before, he had been staring up the one, and now here he was, staring up the other.

On further reflection, he decided that the two had nothing in common, save that both ran in the same direction to the Thames, and both were cluttered and stagnant and had a lot of shit in them.

He had known Isaac for fifty years, and so he knew, with perfect certainty, that Isaac would turn away from the clear, cool, pleasant prospect of Water Lane, and march into the metallic seething of Mint Street. This he now did, and Daniel was content to follow in his wake. He’d never penetrated more than a few yards into the Mint; the farthest he’d ever gotten was the office that was just inside the entrance, on the left side of the Lane, and up some stairs. Of course Isaac swept past it and kept on going.

The Tower of London was essentially square, though, to be pedantic, an elbow in its northern side made it into a pentagon. The strip between inner and outer walls ran the full circuit. The southern side, along the river, was accounted for by Water Lane; but everything else was Mint Street, which was to say that the Mint embraced the Tower of London on three sides (technically four, taking the northern elbow into account).

Strange as it might seem, in a town with but a single street, it was easy to get lost. The view down the street was obstructed by ten different bastions thrust out from the inner wall, and so one could never see very far. Daniel was of course aware that he was in a horseshoe-shaped continuum, but once he lost count of the towers, this did him little practical good. By walking faithfully in one direction or the other, he would eventually come to an extremity of the horseshoe, and exit onto one end or the other of Water Lane. But the length of the Mint was a quarter of a mile, which for a Londoner might as well have been the distance between Oslo and Rome. Such an interval sufficed to distinguish between the Fleet Ditch and the Royal Society, or the Houses of Parliament at Westminster and the knackers’ yards of Southwark. So by the time he’d followed Isaac past a couple of those bastions, and gone round a turn or two, Daniel felt as if he’d ventured deep into a city as outlandish as Algiers or Nagasaki.

Two hundred feet in, the way was bottlenecked by the handsome semicircular curve of Beauchamp Tower. Directly across from it, crammed against the outer wall, were the long casemates where silver and gold were melted down in great furnaces. Continuing north, they immediately passed more casemates containing the coin-bashers. Then they rounded their first corner, another bottleneck between the bastion of Devereux Tower and a low bulky fort in the vertex of the outer wall, called Legge’s Mount. Both were made very strong, and both were still manned by the Black Torrent Guard, to withstand bombardment from that ?ternal Menace, London, which pressed in close on the Tower here.

Isaac slowed, and looked at Daniel as if he wanted to say something.

Daniel glanced curiously down the segment of Mint Street that had just come into view. He was strangely let down to see that it was quiet and almost peaceful. He’d been hoping that the Mint would only become more Hellish the deeper he went into it, like the Inferno according to Dante, and that in its deepest penetralia would be a forge of surpassing hotness where Isaac turned lead into gold. But from this corner ’twas plain that the climax had come already-that all the big, hot, and loud bits were close to the entrance (which made sense logistically, he had to admit) and that this northern limb was what passed for a sedate residential neighborhood. It was about as hellish as Bloomsbury Square. Which only went to show that Englishmen could live anywhere. Condemn an Englishman to hell, and he’d plant a bed of petunias and roll out a nice bowling-green on the brimstone.

Isaac now said something the precise wording of which scarcely mattered. The import was that Daniel was an impediment to his arcane nocturnal researches, and would he please go away. Daniel answered with some pleasantry and Isaac hurried away, leaving Daniel alone to rove up and down a quarter-mile of Mint.

He gave it a once-over, just to stop feeling lost. The northern limb sported a couple of houses at first, obviously for high Mint officials. Then it was workmen’s barracks on the left side, and, on the right, milling machines of some sort, perhaps the ones that stamped inscriptions on the edges of coins to foil clippers.