I grunted. I paced around the room to the knife. I hunkered down, thinking, then looked up the blade of the knife to its hilt. I paced back to the bedroom door and peered at the living room.

The hilt of the knife pointed at Janine's body.

I went back to the bedroom and squinted down the knife toward its tip.

It was pointed at the far wall.

I glanced back at Murphy, now standing in the doorway.

Murphy tilted her head. "What did you find?"

"Not sure yet. Hang on." I walked over to the wall and held up my hand about half an inch from its surface. I closed my eyes and focused on a very faint trace of energy left there. After several moments of concentration, I lowered my hand again. "There's something there," I said. "But it's too faint for me to make it out without using my Sight. And I'm getting sick of doing that."

"What does that mean?" Murphy asked me.

"It means I need something from my kit. Be right back." I went outside and down to my car, where I kept a fisherman's tackle box. I snagged it and went back up to the dead woman's bedroom.

"That's new," Murphy said.

I set the box on the floor and opened it. "I've been teaching my apprentice thaumaturgy. We have to go out to the country sometimes, for safety's sake." I rummaged through the box and finally drew out a plastic test tube full of metallic grains. "I just tossed things into a grocery sack for the first couple of weeks, but it was easier to put together a more permanent mobile kit."

"What's that?" Murphy asked.

"Copper filings," I said. "They conduct energy. If there's some kind of pattern here, I might be able to make it out."

"Ah. You're dusting for prints," Murphy said.

"Pretty much, yeah." I pulled a lump of chalk out of my duster's pocket and squatted to draw a very faint circle on the carpet. I willed it closed as I completed the circle, and felt it spring to life, an invisible screen of power that kept random energies away from me and focused my own magic. The spell was a delicate one, for me anyway, and trying to use it without a circle would have been like trying to light a match in a hurricane.