Tunnels 01, Tunnels

could be risking countless lives, his family's lives. Who knew how it would end? He shuddered at the thought of the Discovery, as Grandma Macaulay had called it, and tried to imagine her being led out into the daylight after her long subterranean life. He couldn't do that to her -- couldn't even bear the thought of it. It was too big a decision for him to take alone, and he felt so terribly alone and isolated.
    He pulled his damp jacket around himself and hustled Cal and Bartleby down into the underpass at the end of the bridge.
    "It reeks of pee down here," his brother commeted. "Do all Topsoilers mark their territories?" He turned to Will inquiringly.
    "Uh, no... not usually. But this is London."
    As they emerged from the underpass and back onto the pavement, Cal seemed confused by the traffic, looking this way and that. Coming to the main road, they stopped at the curb. Will gripped his brother's sleeve with one hand and the cat's hairless scruff with the other. Crossing when there was a lull, they made it to the traffic island. He could see people peering curiously at them from passing cars, and a white van slowed down almost to a halt right beside them, the driver talking excitedly into his cell phone. To Will's relief, it sped off again. They crossed the remaining two lanes and, after a short distance, Will steered them into a dimly lit side street. His brother stood with one hand on the brick wall beside him -- he looked completely disoriented, like a blind man in unfamiliar surroundings.
    "Foul air!" he said vehemently.
    "It's only car fumes," Will replied as he untied the thick string from his light orb and fashioned a slipknot leash for the cat, who didn't seem to mind one bit.
    "It smells wrong. It must be against the laws," Cal said with complete conviction.
    "Fraid not," Will answered as he led them down the street. He would have to stay off the main roads and keep to the backstreets as far as possible, even though it would make their journey even more difficult and circuitous.
    And so the long march north began. On their way out of central London they only saw a single police car, but Will was able to usher them around a corner in the nick of time.
    "Are they like Styx?" Cal asked.
    "Not quite," Will replied.
    With the cat on one side and Cal twitching nervously on the other, they trudged along. From time to time his brother would stop dead in his tracks, as if invisible doors were being slammed in his face.
    "What is it?" Will asked on one of these occasions when his brother refused to move.
    "It's like... anger... and fear," Cal said in a strained voice as he glanced nervously up at the windows over a storefront. "It's so strong. I don't like it."
    "I can't see anything," Will said as he failed to make out what was troubling his brother. They were just ordinary windows, a sliver of light showing between the curtains in one of them. "It's nothing, you're imagining it."
    "No, I'm not. I can smell it," Cal said emphatically, "and it's getting stronger. I want to go."
    After several miles of tortuous ducking and diving, they came to the brow of a hill, at the bottom of which was a busy main road with six lanes of speeding traffic.
    "I recognize this -- it's not far now. Maybe a couple of miles, that's all," Will said with relief.
    "I'm not going near it. I can't -- not with that stench. It'll kill us," Cal said, backing away from Will.
    "C'mon, don't be stupid," Will said. He was just too tired for any nonsense, and his frustration now turned to anger. "We're so close."
    "No," Cal said, digging in his heels. "I'm staying right here!"
    Will tried to pull the boy's arm, but he yanked it away. Will had been fighting his exhaustion for miles and was still struggling to breathe; he didn't need this. All of a sudden, it became too much for him. He thought he was actually going to break down and cry. It just wasn't fair. He pictured the house and his welcoming clean bed. All he wanted to do was lie down and sleep. Even as he was walking, his body kept going loose, as if he were dropping through a hole into a place where everything was so comforting and warm. Then he would yank himself out of it, back to wakefulness, and urge himself on again.
    "Fine!" Will spat. "Suit yourself!" He set off down the hill, tugging Bartleby by the leash.
    As he reached the road, Will heard his brother's voice over the din of the traffic.
    "Will!" he yelled. "Wait for me! I'm sorry!"
    Cal came hurtling down the hill -- Will could