“This isn’t cowardice, even though I’ve seen enough carnage for one morning. This is the only thing I can think of.” He dug his hands in his pockets to feel the reassuring touch of a gun. “I know this makes you feel like govno: it won’t exactly go down in history as my finest hour, either.”

Madeleine groaned, and chased some loose strands of hair away. With one last look behind her, she set a reluctant foot forward. The other followed more easily. Petrovitch half-jogged, half-walked beside her giantess strides. Their path was blocked by the demolished bridge, and they could do nothing else but start to climb over the unstable rubble.

It shifted and slid. A car roof showed green through the dust and boomed as they stepped on it. As they crested the edge of the crazily tilted box-girder roadway, the back end of a railway carriage came into view. All its glass was gone, and anything loose inside had been propelled to the front.

Madeleine glanced at it briefly, then pointedly turned away and concentrated her gaze on where she was placing her feet.

Petrovitch did more. He waited for her to pull ahead, then picked his way to the first visible window. As he approached, he became more and more relieved: the carriage was empty. It was nothing more than a ghost train. He put his head inside to check. No bodies, no blood. No repeat of the lifts inside the Oshicora Tower.

He caught her up and they walked side by side, past the end of the platform and into the long sloping cut that led into the tunnel’s entrance.

“There was no one there,” he said quietly.

“Thanks.”

“That’s okay.” He listened to the sharp, high chatter of a machine pistol as it echoed off the enclosing buildings. “Of course, I could be lying.”

“I know, but then I’d thank you for lying to me.” She looked down at him and picked a glittering bead of glass from between his collar and his neck. It embedded itself in her finger and drew out a bright drop of blood. She flicked both the glass and blood away, then stiffened. “There’s something else coming.”

Petrovitch cocked his head. The violence of the train wreck had left him with ringing ears, and he couldn’t hear anything.

She grabbed his hand and ran up the tracks. Hidden behind the buildings to their right was an Underground line that briefly appeared from the depths before plunging into the shared tunnel ahead. Before disappearing out of sight, there was a section in the open air where the two systems ran parallel to each other.