The white, screaming train was at full gallop – as if in headlong flight from whatever warren it had come from – and the carriage pitched wildly, alarmingly, as the beasts plunged straight for the pickets.

Wickans scattered to either side.

Staring with disbelief, Duiker saw all three figures sawing the reins, bellowing, flinging themselves against the backrest of their tottering perch.

The horses drove hooves into the earth, biting down on their momentum, the towering carriage slewing behind them, raising a cloud of smoke, dust and an emanation that the historian recognized with a jolt of alarm as outrage. The outrage, he now understood, of a warren – and its god.

Behind the lead carriage came another, then another, each pitching to one side or the other to avoid collision as they skidded to a halt.

As soon as the lead carriage ceased its headlong plunge, figures poured from it, armoured men and women, shouting, roaring commands that no-one seemed to pay any attention to, and waving blackened, smeared and dripping weapons.

A moment later, even as the other two carriages stopped, a loud bell clanged.

The frenzied, seemingly aimless activities of the figures promptly ceased. Weapons were lowered, and sudden silence filled the air behind the fading echo of the bell. Snorting and stamping, the lathered horses tossed their heads, ears twitching, nostrils wide.

The lead carriage was no more than fifteen paces from where Duiker and the others stood.

The historian saw a severed hand clinging to an ornate projection on one side of the carriage. After a moment it fell to the ground.

A tiny barred door opened and a man emerged, with difficulty squeezing his considerable bulk through the aperture. He was dressed in silks that were drenched in sweat. His round, glistening face revealed the passing echoes of some immense, all-consuming effort. In one hand he carried a stoppered bottle.