A battle scene was depicted, which for such things was typical enough. It seemed heroes only existed in the midst of death. Barely discernible in the faded weave, armoured reptiles of some sort warred with Tiste Edur and Tiste Andii. The smoke-shrouded sky overhead was crowded with both floating mountains—most of them burning—and dragons, and some of these dragons seemed enormous, five, six times the size of the others even though they were clearly more distant. Fire wreathed the scene, as fragments of the aerial fortresses broke apart and plunged down into the midst of the warring factions. Everywhere was slaughter and harrowing destruction.

‘Pretty,’ murmured Sinn.

‘Let’s check the tower,’ said Grub. All the fires in the scene reminded him of Y’Ghatan, and his vision of Sinn, marching through the flames—she could have walked into this ancient battle. He feared that if he looked closely enough he’d see her, among the hundreds of seething figures, a contented expression on her round-cheeked face, her dark eyes satiated and shining.

They set off for the square tower.

Into the gloom of the corridor once more, where Grub paused, waiting for his eyes to adjust. A moment later green flames licked out from the chamber they had just quit, slithering across the stone floor, drawing closer.

In the ghoulish glow, Sinn smiled.

The fire followed them up the saddled stairs to the upper landing, which was bare of all furnishings. Beneath a shuttered, web-slung window was slumped a desiccated corpse. Leathery strips of skin here and there were all that held the carcass together, and Grub could see the oddity of the thing’s limbs, the extra joints at knee, elbow, wrist and ankle. The very sternum seemed horizontally hinged midway down, as were the prominent, birdlike collarbones.

He crept forward for a closer look. The face was frontally flattened, sharpening the angle where the cheekbones swept back, almost all the way to the ear-holes. Every bone he could see seemed designed to fold or collapse—not just the cheeks but the mandibles and brow-ridges as well. It was a face that in life, Grub suspected, could manage a bizarre array of expressions—far beyond what a human face could achieve.

The skin was bleached white, hairless, and Grub knew that if he so much as touched the corpse, it would fall to dust.

‘Forkrul Assail,’ he whispered.

Sinn rounded on him. ‘How do you know that? How do you know anything about anything?’

‘On the tapestry below,’ he said, ‘those lizards. I think they were K’Chain Che’Malle.’ He glanced at her, and then shrugged. ‘This Azath House didn’t die,’ he said. ‘It just . . . left.’

‘Left? How?’

‘I think it just walked out of here, that’s what I think.’

‘But you don’t know anything! How can you say things like that?’

‘I bet Quick Ben knows, too.’

‘Knows what?’ she hissed in exasperation.

‘This. The truth of it all.’

‘Grub—’