To Lucie’s amazement, the warlock’s flickering outlines resolved into a more solid shape. The ghost’s eyes smoldered with a red anger, but it spoke, its voice hollow. “I am the one who raised it. I, Emmanuel Gast, the most scorned of warlocks. Years ago the Spiral Labyrinth turned against me. They cast me out of warlock society. My golden reward was taken from me. I have been forced to take the lowliest of hires to feed and clothe myself. Yet all this time I studied. I learned. I was wiser than they thought.”

Wise? Lucie wondered. From the look of things, Gast’s recent decisions had been anything but wise.

“I see the way you look at me.” Blood dripped from the ghost’s wounds, a silent patter of black stains on the bare floor. “You scorn me for raising such a demon—a death-dealer, the poisoner of life. But the gold. I needed it. And the demon will kill only Shadowhunters.”

“Someone paid you to do this,” Lucie whispered. “Who? Who did it?”

The ghost hissed. “What are you? You are a Shadowhunter, but not a Shadowhunter. You drag me back from the brink?” It reached out a hand, insubstantial, curling into a claw. “What is this monstrous power…?”

“Monstrous?” Lucie snapped. “What’s monstrous is that you summoned these creatures into this world, knowing the damage they would do—”

“You know nothing of me,” said Gast. “I went to the bridge to raise the demon. I brought it into this world and then I captured it, kept it where it would be safe, a gift for the one who gave me gold. But when I returned here, I was betrayed. I could not stop it. My blood and my life ran out over the floor as my killer tore the demon from its hiding place.”

Lucie could stand no more. “Who did this? Who hired you?”

For an instant Lucie believed Gast would simply vanish away into the shadows and the London smoke. He began to tremble, like a butterfly transfixed with a pin but not yet dead. “I will not tell—”

“You will!” Lucie shouted, her hand outthrust, and she felt something go through her, like electricity through a wire, like the feeling of a rune burning on her skin—

The ghost threw its head back and roared, revealing Gast’s warlock mark—multiple rows of teeth, like a shark. Something hit the door behind Lucie; she stepped aside just in time for James to burst into the room in a cloud of plaster dust: he had smashed the door off its hinges. Cordelia spilled in next, her satchel over her shoulder, and Matthew came after her. The latter two stood blinking in horror at the corpse on the floor.

Lucie glanced at James. He nodded: he could see the ghost as well, in the way all Herondales could. It was a perfectly ordinary ghost sighting, Lucie told herself. This ghost was not Jesse.