But the wound didn’t heal.

“Yes!” Myrnin cried out. “Yes, by manifesting enough to touch you, she makes herself vulnerable—Claire! Here! Come here!” Myrnin cried, and Claire crawled back in his direction. The second she was within reach, he dragged her toward him, putting her against the wall.

Ada was still standing where she’d been, looking down at her and the spreading dark stain on her dress. Her image guttered, flared, sparked, and then stabilized again.

She flashed toward them, screaming that awful, echoing shriek from all the walls. Myrnin pivoted gracefully and hooked the slack of his chain around her silver, two-dimensional throat. Where it touched her, it burned black holes, and her scream grew louder, until it was cracking stone in the walls. She tried to pull free, but the silver wouldn’t let her go. “I’ve got her!” he said, although Claire could see that his whole body was trembling from the strain, and the burn of silver on his hands must have been horrible. “Go, Claire! Get out of here! You have to go!”

She was too weak, too dizzy. The room was a minefield of sinkholes and false floors, and even if she’d known where to step, chances were she’d simply collapse halfway across and disappear into one of those deep, dark chasms . . . .

And she couldn’t just leave him.

“Claire!” His voice was desperate. “You have to go. Go now.”

Now that the lights were on, she could see a clear trail that looked solid, leading all around the room’s edge. Claire stumbled out onto it, guiding herself with both hands on the stone wall, and took one torturous step after another. The lights flickered, and the screaming suddenly cut off behind her.

Claire didn’t dare look back. She was at the door, a black unknown facing her.

Portal.

She couldn’t think. Couldn’t get her head together. Couldn’t remember all the frequencies to align to take her where she needed to go.

Behind her, she heard Ada laugh.

You have to do this. You can do this!

Claire’s eyes snapped open, and without thinking about it, without even meaning to do it, she threw herself forward into the darkness.

And fell out on the other side, into the tunnel beneath Myrnin’s lab. Overhead, the trapdoor was open, letting in streams of pale lamplight. Claire staggered into a wall, bounced, and ran away from the light, into the damp chill of the tunnel.

Twelve long steps, and she heard the cavern echoing overhead. She slapped the wall until she found the lights, flipped them on, and ran toward the keyboard at the center of Ada’s hissing, steaming, clanking metal form.