London Eye: 1 (Toxic City)

As the animal leaped, he ducked low and thrust up with the knife. The dog's paws scraped the side of his head and it howled. He felt a gush of warmth across his hand. Swinging his torch around, he was just in time to see the wounded animal dragging itself away between stone columns.

He looked around at the others. Sparky was fighting the pitbull, using his feet and knees to keep it away from him as he slashed out with his knife. His right hand was hanging by his side now, and blood had darkened his jeans. The dog was mad, foaming at the mouth, growling, scrabbling at Sparky's legs with its claws and gnashing its teeth. For every wound the boy put in its body, it gave him one back.

Behind Jack, Jenna still had Emily. His sister seemed unhurt, though she was looking around with unbridled terror. He hoped she did not try to run. Jenna hefted her backpack, caught Jack's eyes, smiled.

Lucy-Anne had picked up Sparky's dropped knife and was kneeling on the ground, stabbing repeatedly at a meaty mess that had once been a dog. For an instant Jack thought it was the King Charles Spaniel that Sparky had brought down, but then he saw that this animal was larger, its legs black and brown. She stabbed, slashed, hacked, and though the creature was obviously dead, her rage seemed to be growing.

“Jenna,” Jack said, glancing back at his sister and friend.

Yet again, Jenna seemed to read his mind. She glanced past Jack at Lucy-Anne. “Go,” she said. “I've got Emily.”

Keeping an eye out for the injured Labrador, Jack hurried across to Lucy-Anne. As he drew close she span around and crouched, bloody knife in one hand, the other held out for balance. And for a moment shorter than a blink, he thought she was going to come at him. Her eyes were white pools in a face smeared with blood, her teeth bared, and she reminded him of one of their crazed attackers.

“It's dead,” Jack said. A waving torch beam played across the corpse at Lucy-Anne's feet. Steam rose.

Lucy-Anne's eyes closed slightly, her lips softened over her teeth, and she stood.

“Watch out!” Emily called.

A yellow blur erupted from the shadows and struck Lucy-Anne from behind. She went down, eyes widening in surprise now rather than fury, and dropped Sparky's knife. Jack actually heard the wind knocked from her as she hit the ground, the Labrador falling on top of her.

He went to help, but not fast enough. The dog bit into the back of Lucy-Anne's neck, jaw working as it tried to penetrate skin, flesh and gristle. It shook its head, and as Jack thrust his knife between its ribs Lucy-Anne shrieked, a terrible sound that turned wet.

“Lucy-Anne!”

Sparky appeared by his side, kicking at the dog even as Jack stabbed it again. It died with a violent shudder. Sparky heaved it off, and Jack had to use his knife to prise its jaws apart, away from Lucy-Anne's neck. Someone kept their torch played on her, and Jack wished he could not see so much detail.

“The other one?” he asked.

“Dead,” Sparky said. “All four, dead. Let's just hope there are no more.”

“This is the same pack,” Rosemary said.

Sparky surged upright, and from the corner of his eye Jack was aware of a flash of movement, a growl of anger. “You led us down into this!” Sparky said. He grabbed Rosemary by her coat's collar and almost lifted her, pushing her back against one of the stone columns. “We followed you down here, and all the time you knew what could be waiting for us!”

“I was afraid you wouldn't come!”

Lucy-Anne was moaning before him, Emily was crying, face pressed into Jenna's neck, and now Sparky was about to beat on the old woman. Jack knew they did not need this at all.

“Sparky!” he shouted. His friend turned. “I need you here. We're through it, but we're all hurt.”

Sparky let go and came slowly to Jack's side. He was looking down at Lucy-Anne. There was so much blood.

“I'll help her first,” Rosemary said. “Then you, Sparky. Then Jack. I think Jenna and Emily are unhurt, so—”