“Mark—”

“Please,” he said. “This is—if you respect my privacy, please, go inside.”

She hesitated. But his expression was clear. He knew what he was asking. She turned and went in through the Institute’s back door, letting it bang loudly shut behind her.

The stairs loomed up in front of her, but she couldn’t climb them. She barely knew Mark Blackthorn. But as she went to put her foot on the first step, she thought of the scars on his back. Of the way he had curled into a ball in his bedroom that first day, the way he had accused Julian of being a dream or a nightmare sent to haunt him by the Wild Hunt.

She didn’t believe in the Cold Peace, had never believed in it, but Mark’s pain had torn away at her beliefs. Perhaps the faeries truly were that cruel. Perhaps there really was no good in them, no honor. And if that was the case, how could she leave Mark out there, alone, with one of them?

She whirled around and pushed the door open—and froze.

It took a moment for her gaze to find them, but when it did, Mark and Kieran seemed to leap out at her like the images from a lighted screen. They stood in a patch of moonlight at the edge of the lot, Mark’s back against one of the scrub oak trees. Kieran was leaning against him, pinning him to the tree, and they were kissing.

Cristina hesitated a moment, blood rising into her face, but it was clear Mark wasn’t being touched against his will. Mark’s hands were tangled in Kieran’s hair, and he was kissing him as fiercely as if he were starving. Their bodies were pressed together tightly; nevertheless, Kieran clutched at Mark’s waist, his hands moving restlessly, desperately, as if he could pull Mark closer still. They slid up, pushing Mark’s jacket off his shoulders, stroking the skin at the edge of his collar. He made a low keening sound, like a cry of grief, deep in his throat, and broke away.

He was staring at Mark, his gaze as hungry as it was hopeless. Never had a faerie looked so human to Cristina as Kieran did then. Mark looked back at him, eyes wide, shining in the moonlight. A shared look of love and longing and terrible sadness. It was too much. It had already been too much: Cristina knew she shouldn’t have been watching them but she hadn’t been able to stop, mingled shock and fascination rooting her to the spot.

And desire. There was desire, too. Whether for Mark, or for both of them, or just for the idea of wanting someone so much, she wasn’t sure. She moved back, her heart pounding, about to pull the door shut after her—

And the whole parking lot lit up like a stadium as a car rounded the corner and turned into it. Music blared out the windows; Cristina could hear Emma’s and Julian’s voices.

Her gaze darted back toward Mark and Kieran, but Kieran had vanished, a shadow into shadows. Mark was bending down to pick up his jacket as Emma and the others piled out of the car.

Cristina pulled the door shut. Through it she heard Emma ask Mark where she was, and Mark say that she had gone inside. He sounded casual, calm, as if nothing had happened.

But everything had happened.

She had wondered, when he’d looked in her eyes and said that he’d had to make do without mirrors in the Wild Hunt, whose eyes he’d been looking into for all those years.

Now she knew.

The Wild hunt, some Years ago

Mark Blackthorn came to the Wild Hunt when he was sixteen years old, and not because he wanted to.

He remembered only darkness after he had been taken from the Institute that was his home, before he woke in underground caverns, amid lichen and dripping moss. A massive man with eyes of two different colors was standing over him, carrying a horned helmet.

Mark recognized him, of course. You couldn’t be a Shadowhunter and not know about the Wild Hunt. You couldn’t be half-faerie and not have read about Gwyn the Hunter, who had led the hunt for centuries. He wore a long blade of hammered metal at his waist, blackened and twisted as if it had been through many fires. “Mark Blackthorn,” he said, “you are with the Hunt now, for your family is dead. We are your blood kin now.” And drawing the sword, he sliced across his palm until he drew blood, and dripped it into water for Mark to drink.

In the years to come Mark would see others come to the Hunt, and Gwyn say the same thing to them, and watch them drink his blood. And he would watch their eyes change, splintering into two different colors as if to symbolize the division of their souls.

Gwyn believed a new recruit had to be broken down to be built back up again as a Hunter, someone who could ride through the night without sleep, someone who could suffer hunger that was close to starvation and endure pain that would break a mundane. And he believed their loyalty must be unswerving. They could choose no one over the Hunt.

Mark gave his loyalty to Gwyn, and his service, but he did not make friends among the Wild Hunt. They were not Shadowhunters, and he was a Shadowhunter. The others were all of the faerie Courts, pressed into service with the Hunt as punishment. They did not like the fact that he was Nephilim, and he felt their scorn and scorned them in turn.

He rode through the nights alone, on a silver mare given to him by Gwyn. Gwyn seemed, perversely, to like him, perhaps to spite the others of the Hunt. He taught Mark to navigate by the stars and to listen for the sounds of a battle that might echo through hundreds, even thousands of miles: cries of anger and the shouts of the dying. They would ride to the field of battle and, invisible to mundane eyes, divest the dead bodies of precious things. Most of them were paid in tribute to the Seelie and Unseelie Courts, but some Gwyn kept for himself.