At one point, near King's Cross, they had heard the dim sound of clashing weapons and shouts echoing from one of the myriad tunnels converged there. They presumed it was the main Tuatha De Danann force encountering resistance somewhere.
Nuada was keen to reunite with his comrades to offer support if needed, but Veitch argued fiercely against this. The tunnel system was so complex the chances of locating them were slim-they could spend days wandering around down there, he stressed. And time was not on their side; at least some of them had to reach their destination.
After a heated debate, Nuada once again gave in, though Ruth could sense his patience with a Fragile Creature was growing thin.
Veitch came back to her side once Old Street and Moorgate stations were behind them. The air had grown several degrees colder and there was a deeply unpleasant smell that Ruth didn't want to examine too closely.
"Back in your good books now, am I?" she asked tartly and instantly hated herself, but she had been unable to resist the gibe.
This time it washed over Veitch; he had other things on his mind. "Bank next. We'll have to go up top soon." He paused. "That fighting we heard must mean there are Fomorii down here. We've been lucky not to meet any of them."
"Luck doesn't begin to explain it. I can't believe they've left one of the main routes into their most sacred places completely free from guards."
Lugh hurried back, hushing them into silence.
"There," Ruth hissed childishly, "tempting Fate again."
Distant sounds carried to them from ahead. It suggested many bodies on the move; the occasional foul stink caught on the air currents told them it was the Fomorii.
"They're going to push us all the way back to Moorgate before we can find somewhere to lie low," Ruth said dismally.
"Shit!" Veitch looked around like a cornered animal. "We can't waste the-"
One of the Tuatha De Danann was motioning to a shadowy area on the eastern wall. They hurried over to see a small tunnel wide enough for a couple of people. Veitch dived in to investigate. Less than a minute later he was back, grinning broadly. "It leads to another tunnel. We can hide in there."
"Haste, then," Nuada said. "They are almost upon us."
They bustled in as silently as possible. They had barely vacated the Northern Line when they heard the heavy tramp of many feet drawing closer. From the noise and the time it took them to pass, Ruth guessed there must have been at least five hundred, possibly on their way to fight the Tuatha De Danann. She hoped that meant the Fomorii forces they were joining were doing badly.
At one point, it sounded like the Fomorii were coming down the connecting tunnel so they all hurried several hundred yards away and flattened themselves against the wall, desperately trying to shield their torches. After a couple of minutes, Ruth's pounding heart subsided a little.
The tunnel had patently not been used for a long time. Most of the tracks had been torn up, and the occasional signs appeared to date back to the earliest days of the tube system in the late nineteenth century. Ancient junction boxes rusted against bricks covered in the white salt of age and damp. Where the rails should have been there were numerous hummocks and rough piles that Ruth guessed were the dust-covered detritus of work on the other tunnel.
Once all the sounds of the Fomorii had faded away, they relaxed. "God, they smell so bad!" Ruth protested.
"They are being driven by their Caraprix." Nuada was looking back and forth along the tunnel. "When the Caraprix take an active role in direction it stimulates a powerful aroma."
"Even in you?" she said acidly.
"We, of course," he said with a smile, "smell divine."
They set off back the way they had come, but after they had been walking for five minutes it became apparent to Ruth they had gone past the connecting tunnel in the dark. "We must have missed it," she called out to the others.
"I didn't see anything," Veitch said, much to Ruth's irritation. "Let's carry on a little way."
Three minutes later their torches began to illuminate irregular shapes in the distant gloom. "Look, it's a station," Ruth sighed when they were closer. "I told you we'd gone past it."
Veitch held up his torch to read the sign over the platform. "King William Street?" he said. "Never heard of it."
"It must be one they don't use any more," Ruth said. "There are quite a few, aren't there? But you're right, I've never heard of this one."
Veitch's torch illuminated dirty, broken tiles and some torn, peeling posters. One said Light's Out! Another, Loose Lips Sink Ships.
"Looks like it was used as an air raid shelter in the Second World War," Ruth said.
"We need more wood," Lugh said. "The torches are burning through quickly."
"There might be some here," Veitch said. "Send your men in to check."
Lugh eyed him darkly; this sounded very much like an order, but then he motioned for three of the Tuatha De Danann to investigate.
"What time do you reckon it is?" Veitch said, leaning against the edge of the platform.
Ruth shrugged. "My body clock says eleven… midnight… Maybe later."
"We should rest."
Ruth was glad Veitch had raised it. She felt exhausted, but she was afraid to bring it up herself in case the others thought her weak. Nuada nodded in agreement and passed the information to his followers.
"We're close enough to spare a couple of hours," Veitch continued. "And we'd be no use to anyone if we turned up at the Big Bastard's door completely knackered."
"You don't have to convince me." Ruth clambered wearily on to the platform and found a spot against the wall at one end. Behind the windows of an old office she could see the torches of the Tuatha De Danann moving around like lazy fireflies as they searched for wood.
Nuada, Lugh and the others sat quietly at the other end of the platform, talking in low voices. Ruth was surprised when Veitch sat next to her; he didn't speak, but the fact that he was there was a loud statement. He closed his eyes and was asleep in an instant. Ruth wished she could rest just as easily, but by the time the thought had entered her head she was out.
She stirred uncomfortably, irritated by the cold surface of the hard platform floor against her behind. As her eyes flickered open when she tried to shift into a more comfortable position, she realised she couldn't have been asleep for very long at all because lights were still moving behind the office windows, beautiful, like a golden snowstorm, lulling her back to sleep.
She was so tired, enjoying the comfort of rest. Her limbs felt light and airy, after the leaden weight of the long march. Her troubled mind was cocooned in a fuzzy, yellow warmth. Yet as she tried to snuggle back into her pleasant state, she was annoyed to feel something nagging at the back of her mind. With annoyance, she tried to damp it down, but it wouldn't go away. The warmth slipped further away. Finally she realised the only way she was going to get any sleep was to examine it; something about what she had seen.
She opened her tired eyes again. The platform and track was quiet and still. The Tuatha De Danann sat in close conversation. Veitch was beside her asleep. Nothing out of the ordinary.
She tried again to get back to sleep, but it was lost to her now. The feelings of alarm wound up a notch. There was something there. What was she missing?
She looked around once more before settling on the light in the windows. She pulled herself shakily to her feet. Still half asleep, she focused hazily on the light shimmering through the panes. Earlier she had thought of it as fireflies, and now it seemed even more like that. Through her daze it was hypnotic in its dreaminess. Fireflies. No, more like butterflies. And then she had it. At first she felt shock, and then a deep iciness, before she was running along the platform to raise the alarm.