“Yo, Jason,” called a black-haired vampire girl in a blue minidress. She was looking at him expectantly, but from what she’d called him, she couldn’t know him that well.

“Actually, it’s Jace,” said Janus casually, still moving for the exits.

He didn’t understand what he’d said wrong, but he understood it had been something. Instant alarm flashed across her face, and she darted away through the crowd, making it out of the Market, but even a vampire wasn’t faster than Janus. Nobody was.

He cornered her in an alleyway, backhanding her when she fought, pinning her thrashing limbs. He got his dagger to her throat, but she didn’t stop struggling.

“You’re not Jace,” said the vampire girl. “What are you? Eidolon? Shape-shifter? Herondale cosplayer?” She squinted at him.

He was going to have to break her neck, he realized. Tedious. Vampires were hard to kill, but he was still stronger than they were. “I am Jace Herondale,” he told her. It was a relief to say it to someone, even someone who was going to die. “A stronger, better Jace Herondale than you have in this world. Not that you’ll understand a word I say.”

He reached for her throat, but she was staring at him with a look of realization. “You’re from Thule,” she said. “Alec told me about this freaky other world where Clary died and everything was screwed literally to hell. And Jace was bound to Sebastian Morgenstern. You’re that Jace.”

She glared up at him defiantly, and something about her face rang a dull, funereal bell.

“I know who you are too,” Janus said slowly. “You’re Lily Chen. In my world, Sebastian killed you.”

“He did?” Lily looked outraged. “To hell with that guy. Irony intended.”

“You’re the girl Raphael Santiago started a war for.”

Lily abruptly and entirely ceased fighting. It was startling enough that Janus almost let go, but his father had trained him to be remorseless.

“What?” Her voice trembled. “Raphael?”

“When Sebastian was taking over,” Janus said slowly, lost to memory, to the time when Clary fell and the world broke, “the warlocks were gone. The faeries were with us. Sebastian asked the vampires and the werewolves to join him. Most of the vampires left were rounded up by Raphael Santiago, the head of the New York vampire clan, and Sebastian was in talks with him. Raphael was not pleased by what had happened to the warlocks, but he said he was the practical type. He wanted protection for his vampires. We thought we might be able to come to an arrangement. Only Sebastian found out you were sending secret information to a werewolf girl. He asked if you wanted to have fun with him, and you said you did.”