"There's nothing here," he announced after a cursory examination. But Catso hadn't finished his search. The deeper he dug the more layers of filthy clothing presented themselves to his eager hands. Pope had more pockets than a master magician.

Karney glanced up from the forlorn heap of belongings and found, to his discomfort, that Pope's eyes were on him. The old man, exhausted and beaten, had given up his protests. He looked pitiful. Karney opened his hands to signify that he had taken nothing from the heap. Pope, by way of reply, offered a tiny nod.

"Got it!" Catso yelled triumphantly. "Got the fucker!" and pulled a bottle of vodka from one of the pockets. Pope was either too feeble to notice that his alcohol supply had been snatched or too tired to care. Whichever way, he made no sound of complaint as the liquor was stolen from him.

"Any more?" Brendan wanted to know. He'd begun to giggle, a high-pitched laugh that signaled his escalating excitement. "Maybe the dog's got more where that came from," he said, letting Pope's hands fall and pushing Catso aside. The latter made no objection to the treatment. He had his bottle and was satisfied. He smashed off the neck to avoid contamination and began to drink, squatting in the dirt. Red relinquished his grip on Pope now that Brendan had taken charge. He was clearly bored with the game. Brendan, on the other hand, was just beginning to get a taste for it.

Red walked over to Karney and turned over the pile of Pope's belongings with the toe of his boot.

"Fucking wash-out," he stated, without feeling.

"Yeah," Karney said, hoping that Red's disaffection would signal an end to the old man's humiliation. But Red had thrown the bone to Brendan, and he knew better than to try and snatch it back. Karney had seen Brendan's capacity for violence before and he had no desire to watch the man at work again. Sighing, he stood up and turned his back on Brendan's activities. The echoes off the tunnel's wall were all too eloquent however, a mingling of punches and breathless obscenities. On past evidence nothing would stop Brendan until his fury was spent. Anyone foolish enough to interrupt him would find themselves victims in their turn.

Red had sauntered across to the far side of the tunnel, lit a cigarette, and was watching the punishment meted out with casual interest. Karney glanced around at Catso. He had descended from squatting to sitting in the dirt, the bottle of vodka between his outstretched legs. He was grinning to himself, deaf to the drool of pleas falling from Pope's broken mouth.

Karney felt sick to his stomach. More to divert his attention from the beating than out of genuine interest, he returned to the junk filched from Pope's pockets and turned it over, picking up one of the photographs to examine. It was of a child, though it was impossible to make any guess as to family resemblance. Pope's face was now barely recognizable; one eye had already begun to close as the bruise around it swelled. Karney tossed the photograph back with the rest of the mementoes. As he did so he caught sight of a length of knotted cord which he had previously passed over. He glanced back up at Pope. The puffed eye was closed, the other seemed sightless. Satisfied that he wasn't being watched, Karney pulled the string from where it lay, coiled like a snake in its nest, among the trash. Knots fascinated him and always had. Though he had never possessed skill with academic puzzles (mathematics was a mystery to him; the intricacies of language the same) he had always had a taste for more tangible riddles. Given a knot, a jigsaw or a railway timetable, he was happily lost to himself for hours. The interest went back to his childhood, which had been solitary. With neither father nor siblings to engage his attention what better companion than a puzzle?

He turned the string over and over, examining the three knots set at inch intervals in the middle of its length. They were large and asymmetrical and seemed to serve no discernible purpose except, perhaps, to infatuate minds like his own. How else to explain their cunning construction except that the knotter had been at pains to create a problem that was well nigh insoluble? He let his fingers play over the surfaces of the knots, instinctively seeking some latitude, but they had been so brilliantly contrived that no needle, however fine, could have been pushed between the intersected strands. The challenge they presented was too appealing to ignore. Again he glanced up at the old man. Brendan had apparently tired of his labors. As Karney looked on he threw the old man against the tunnel wall and let the body sink to the ground. Once there, he let it lie. An unmistakable sewer stench rose from it.

"That was good," Brendan pronounced like a man who had stepped from an invigorating shower. The exercise had raised a sheen of sweat on his ruddy features; he was smiling from ear to ear. "Give me some of that vodka, Catso."

"All gone," Catso slurred, upending the bottle. "Wasn't more than a throatful in it."

"You're a lying shit," Brendan told him, still grinning.

"What if I am?" Catso replied, and tossed the empty bottle away. It smashed. "Help me up," he requested of Brendan. The latter, his great good humor intact, helped Catso to his feet. Red had already started to walk out of the tunnel; the others followed.

"Hey Karney," Catso said over his shoulder, "you coming?"

"Sure."

"You want to kiss the dog better?" Brendan suggested. Catso was almost sick with laughter at the remark. Karney made no answer. He stood up, his eyes glued to the inert figure slumped on the tunnel floor, watching for a flicker of consciousness. There was none that he could see. He glanced after the others. All three had their backs to him as they made their way down the track. Swiftly, Karney pocketed the knots. The theft took moments only. Once the cord was safely out of sight he felt a surge of triumph which was out of all proportion to the goods he'd gained. He was already anticipating the hours of amusement the knots would furnish. Time when he could forget himself, and his emptiness; forget the sterile summer and the loveless winter ahead; forget too the old man lying in his own waste yards from where he stood.

"Karney!" Catso called.

Karney turned his back on Pope and began to walk away from the body and the attendant litter of belongings. A few paces from the edge of the tunnel the old man behind him began to mutter in his delirium. The words were incomprehensible. But by some acoustic trick, the walls of the tunnel multiplied the sound. Pope's voice was thrown back and forth and back again, filling the tunnel with whispers.

Itwasn't until much later that night, when he was sitting alone in his bedroom with his mother weeping in her sleep next door, that Karney had the opportunity to study the knots at leisure. He had said nothing to Red or the others about his stealing the cord. The theft was so minor they would have mocked him for mentioning it. And besides, the knots offered him a personal challenge, one which he would face-and conceivably fail-in private.

After some debate with himself he elected the knot he would first attempt and began to work at it. Almost immediately he lost all sense of time passing; the problem engrossed him utterly. Hours of blissful frustration passed unnoticed as he analyzed the tangle, looking for some clue as to a hidden system in the knotting. He could find none. The configurations, if they had some rationale, were beyond him. All he could hope to do was tackle the problem by trial and error. Dawn was threatening to bring the world to light again when he finally relinquished the cord to snatch a few hours of sleep, and in a night's work he had merely managed to loosen a tiny fraction of the knot.

Over the next four days the problem became an idee fixe, a hermetic obsession to which he would return at any available opportunity, picking at the knot with fingers that were increasingly numb with use. The puzzle enthralled him as little in his adult life ever had. Working at the knot he was deaf and blind to the outside world. Sitting in his lamp-lit room by night, or in the park by day, he could almost feel himself drawn into its snarled heart, his consciousness focused so minutely it could go where light could not. But despite his persistence, the unraveling proved a slow business. Unlike most knots he had encountered, which, once loosened in part, conceded the entire solution, this structure was so adroitly designed that prising one element loose only served to constrict and tighten another. The trick, he began to grasp, was to work on all sides of the knot at an equal rate, loosening one part a fraction then moving around to loosen another to an equal degree, and so on. This systematic rotation, though tedious, gradually showed results.