She held it out, palm up, ready to snatch it back if he took out anything sharp.

Reaching into one of the pockets of his coat, the troll drew out a spool of green thread. "Your left hand," he said.

She gave him her other hand and watched as he wound her first, middle, and ring fingers with the string, tying one knot on each digit. "What is this supposed to do?" she asked.

"It will help you make your deliveries."

She nodded, looking at her fingers. How could this be magic? She'd expected something that glittered and glowed, not mundane stuff. String was just string. She wanted to ask about it again, but she thought it might be rude, so she asked something else she'd been wondering about. "Why does iron bother faeries?"

"We don't have it in our blood like you do. More than that, I don't know. There was a king of the Unseelie Court poisoned with but a few shards quite recently. His name was Nephamael and he thought to make an ally of iron—he wore a band of it at his brow, letting the burns scar deep until his flesh was so toughened it could scar no more. But that did not toughen his throat. He died choking on the stuff."

"What are these Courts?" Val asked.

"When there are enough faeries in an area they often organize themselves into groups. You might call them gangs, but the Folk usually call them Courts. They occupy some territory, often fighting with other nearby Courts. There are Seelie Courts, which we call Bright Courts, and the Unseelie Courts, or Night Courts. You might, at first glance, think that the Bright Courts were good and the Night Courts evil, but you would be much, although not entirely, mistaken."

Val shuddered. "Am I going to be doing deliveries alone? Are any of the others coming with me?"

His golden eyes glittered in the firelight. "Others? Luis is the only human courier I've ever had. Is there someone else you are thinking of?"

Val shook her head, not sure what she should say.

"It doesn't matter. I would ask that you do these tasks alone and that you do not speak of them with any of the… others."

"Okay," Val said.

"You are under my protection," he said, letting her take the bottle. "Still, there are things I would have you know about the fey. Do not tarry with them and take nothing they offer, especially food." She thought of the magicked stone she had fed to an old man and nodded grimly, guiltily. "Put this comfrey in your shoe. It will help you keep safe and speed your travel. And here's madwort to keep you from fascination. You can tuck that into your pocket."

Val took the plants, toed off her left sneaker, and tucked the comfrey inside. She could feel it there, nestled against her sock, oddly comforting and alarming because it was comforting.

When she emerged on the street again, she felt a tug from the thread twined around her first finger. Magic! It made her smile despite everything else as she started in that direction.

It was still early evening when she made it to Washington Square Park. She'd stopped along the way and spent stolen money on a ham sandwich that she was still too sick to digest, despite her hunger, and had to toss it away half-eaten. She'd even managed to wash her face in an icy fountain, where the water tasted of rust and pennies.

The three bottles of whatever-they-were clanked together in her backpack, heavier than they would have been if she hadn't been so tired. She longed to uncork one and taste the contents, to bring back the power and fearlessness of the night before, but she was wary enough of her exhaustion today that she didn't.

Walking through the park, past NYU students in bright scarves, past people hurrying to dinner or walking their tiny, sweatered dogs, she realized that she had no idea what she was looking for. The thread pulled her toward a pack of middle-schoolers in expensive skater clothes climbing up on one of the interior fences. One floppy-haired boy in low-slung jeans, skull-print knee pads and checkerboard Vans was louder than the rest, standing on the top rung and whooping at three girls leaning against the thick trunk of a tree. They all had bare feet and hair the color of honey.

The thread all but dragged her to the three girls before it unraveled.

"Um, hi," Val said. "I have something of yours, I think."

"I can smell the glamour on you, thick and sweet," said one. Her eyes were gray as lead. "If you're not careful, a girl like you could get carried off under the hill. We'd leave a bit of wood behind and everyone would weep over it, because they'd be too stupid to know the difference."

"Don't be awful to her," said another, twirling a lock of hair around her hand. "She can't help being blind and dumb."

"Here," Val said, pushing the bottle into the hands of the one that hadn't spoken. "Take your medicine like good little girls."

"Ooooh, it has a tongue," said the girl with the gray eyes.

The third girl just smiled and glanced at the boy on the fence.

One of the others followed her look. "He's a pretty one," she said.

Val could barely tell the girls apart. They all had long, willowy limbs and hair that seemed to move with the slightest breeze. With their thin clothes and unshod feet, they should have been cold, but she could see they weren't.

"Do you want to dance with us?" a faerie girl asked Val.

"He wants to dance with us." The gray-eyed faerie gave the loud skater boy a wide grin.

"Come dance with us, messenger," said the third, speaking for the first time. Her voice was like a frog croaking and when she spoke, Val saw that her tongue was black.

"No," Val said, thinking of the troll's warnings and the madwort in her pocket. "I have to go."

"That's all right," said the gray-eyed faerie, toeing the earth with one bare foot. "You'll visit us again when you aren't so gaudy with spells. At least I hope you will. You're almost as pretty as he is."

"I'm not pretty at all," said Val.

"Suit yourself," said the girl.

She wasn't sure what she should expect to find as she passed by boarded-up tenement houses and bodegas with broken front windows. The building that the string on her finger tugged her toward was boarded up, too, and Val was surprised to see a garden blooming on the roof. Long tendrils of plants hung over the side and what looked like half-grown trees sprouted from what must have been thin soil, all of it trapped by an aluminum cage that capped the building. Val walked up to the entrance, now overgrown with ivy. On the second floor, the windows were completely missing, gaping holes in the brick, and she could almost see the rooms inside.

As she stepped onto the cracked front steps, the thread untied itself from her middle finger to drop into the nearby grass.

She took out the bottle from her backpack and set it down, thinking of the troll's directions.

Something rustled in the grass and Val yelped, jumping back, suddenly aware of how strangely quiet things had gotten. The cars still streaked by and the city sounds were still there, but they had faded somehow. A brown rat poked its head out of the grass, beady black eyes like polished pebbles, pink nose twitching. Val laughed with relief.

"Hey there," she said, squatting down. "I hear that you can bite through copper. That's really something."

The rat turned and scurried back through the grass as Val watched. A figure moved out of the shadows to scoop up the rodent and set it on a wide shoulder.

"Who…" Val said and stopped herself.

He stepped into the light, a creature nearly tall as the troll and thicker, with horns that curved back from his head like a ram's and a thick brown beard that ran to green at the tips. He was clad in a patchwork coat and hand-stitched boots.

"Come inside and warm up," he said, picking up the corked beer bottle. "I have some questions for you."