He sat at his table, a deck of playing cards spread out in front of him in what could be either a fortune-telling through the cards or a game of solitaire—they tended to have about the same amount of significance, in my experience.

“Did I hear a shot, Sir Stuart?” Mort asked absently, staring intently at the cards. Then his hands froze in the act of dealing another, and he shot to his feet, whirling to face me. “Oh, perfect.”

“Hiya, Morty,” I said.

“This is not happening,” Mort said, promptly getting up from the table and walking quickly toward another room. “This just can’t be happening. No one is this unlucky.”

I hurried forward, trying to keep up, and followed him into a hallway. “I need to talk to—”

“I don’t care,” Mort said, his arms crossing each other in a slashing, pushing-away gesture, never stopping. “I do not see you. I am not listening to you, Dresden. It’s not enough that you have to keep dragging me into things in life. So now your stupid ghost shows up to do it, too? No. Whatever it is, no.”

We entered a kitchen, where I found Sir Stuart already present, his arms folded, leaning back against a wall with a quiet smile as he watched. Mort went to a large cookie jar, opened it, and took out a single Oreo before replacing the lid.

“Morty, come on, it’s never been like that,” I said. “I’ve come to ask your help a couple of times because you’re a capable professional and—”

“Bullshit,” Mort snapped, spinning to face me, his eyes flashing. “Dresden came to me when he was so desperate he might as well try any old loser.”

I winced. His summation of our relationship was partially true. But not entirely. “Morty, please.”

“Morty, what?” he snapped back. “You’ve got to be kidding me. I am not getting involved in whatever international crisis you mean to perpetrate next.”

“It’s not like I’ve got a lot of choice in the matter, man. It’s you or no one. Please. Just hear me out.”

He barked out an incredulous little laugh. “No, you hear me out, shade. No means ‘no.’ It isn’t happening. It isn’t ever going to happen. I said no!” And then he slammed the door to the next room in my face.

“Dammit, Morty,” I snarled, and braced myself for the plunge through his door after him.

“Dresden, st—!” Sir Stuart said.

Too late. I slammed my nose and face into the door and fell backward onto my ass like a perfect idiot. My face began to throb immediately, swelling with pain that felt precisely normal, identical to that of any dummy who walked into a solid oak door.

“—op,” Sir Stuart finished. He sighed, and offered me a hand up. I took it and he hauled me to my feet. “Ghost dust mixed into the paint inside the room,” he explained. “No spirit can pass through it.”

“I’m familiar with it,” I muttered, and felt annoyed that I hadn’t thought of the idea before, as an additional protection against hostile spirits at my own apartment. To the beings of the immaterial, ghost dust was incontrovertible solidity. Thrown directly at a ghost, it would cause tremendous pain and paralyze it for a little while, as if the spook had been suddenly loaded down with an incredible and unexpected weight. If I’d put it all over my walls, it would have turned them into a solid obstacle to ghosts and their ilk, shutting them out with obdurate immobility.