For me, the equation broke down into fairly simple elements. The demon, hungry for its revenge, would come after those who had struck it down. The ghost would only remember those who had been there, whom it had focused on in those last moments. That meant that Murphy and Michael would be its remaining targets. Michael had a chance of protecting himself against the thing - hell, maybe a better chance than me. Murphy didn't.
I got on the phone to Murphy's place. No answer. I called the office, and she answered with a fatigue-blurred, "Murphy."
"Murph," I said. "Look, I need you to trust me on this one. I'm coming down there and I'll be there in about twenty minutes. You could be in danger. Stay where you are and stay awake until I get to you."
"Harry?" Murphy asked. I could hear her starting to scowl. "You telling me you're going to be late?"
"Late? No, dammit. Look, just do what I said, all right?"
"I do not appreciate this crap, Dresden," Murphy growled. "I haven't slept in two days. You told me you'd be here in ten minutes, and I told you I'd wait."
"Twenty. I said twenty minutes, Murph."
I could feel her glare over the phone. "Don't be an asshole, Harry. That's not what you said five minutes ago. If this is some kind of joke, I am not amused."
I blinked, and a cold feeling settled into my gut, into the hollow place the Nightmare had torn out of me. The phone line snapped, crackled, and popped, and I struggled to calm down before the connection went out. "Wait, Murphy. Are you saying you talked to me five minutes ago?"
"I am about two seconds short of killing the next thing that pisses me off, Harry. And everything keeping me out of bed is pissing me off. Don't get added to the list." She hung up on me.
"Dammit!" I yelled. I hung up the phone and dialed Murphy's number again, but only got a busy signal.
Something had talked to Murphy and convinced her she was talking to me. The list of things that could put on someone else's face was awfully long, but the probabilities were limited: either another supernatural beastie had wandered onto the stage or, I gulped, the Nightmare had taken a big enough bite of me that it could put on a convincing charade.
Ghosts could take material form, after all - if they had the power to form a new shape out of material from the Nevernever, and if they were familiar enough with the shape. The Nightmare had eaten a bunch of my magic. It had the power it needed. And it had the familiarity it needed.
Hell's bells, it was pretending to be me.
I hung up the phone and tore around the house frantically, collecting car keys and putting together an improvised exorcism kit from stuff in my kitchen: Salt, a wooden spoon, a table knife, a couple of storm candles and matches, and a coffee cup. I stuffed them all into an old Scooby-Doo lunch box, then, as an afterthought, reached into a bag of sand that I keep in the kitchen closet for Mister's litter box, and tossed a handful into a plastic bag. I added the scorched staff and blasting rod to the accumulating pile of junk in my arms. Then I ran for the door.
I hesitated, though. Then went to the phone and dialed Michael's number, fingers dancing over the rotary. It was also busy. I let out a shriek of purest frustration, slammed down the phone, and ran out the door to the Blue Beetle.
It was late. Traffic could have been worse. I got there in less than the twenty minutes I'd promised Murphy and parked the car in one of the visitor's parking spaces.
The district station Murphy worked in crouched down amongst taller buildings that surrounded it, solid and square and a bit battered, like a tough old sergeant amongst a forest of tall, young recruits. I ran up the stairs, taking my blasting rod with me, with my Scooby-Doo lunch box in my right hand.
The grizzled old sergeant behind the desk blinked at me as I came panting through the doorway. "Dresden?"
"Hi," I panted. "Which way did I go?"
He blinked. "What?"
"Did I come through here a minute ago?"
His thick, grey moustache twitched in nervous little motions. He took a look at his clipboard. "Yeah. You went up to see Lieutenant Murphy just a minute ago."
"Great," I said. "I need to see her again. Buzz me through?"
He peered at me, a little closer, then reached forward to buzz me through. "What's going on here, Mr. Dresden?"
"Believe me," I said, "As soon as I work that out, I'll be sure to tell you." I opened the door and headed through, up the stairs, and toward the S.I. offices on the fourth floor. I pounded through the doors and sprinted down the rows of desks toward Murphy's office. Stallings and Rudolph both started up from their chairs, blinking as I went past.
"What the hell?" Rudy blurted, his eyes widening.
"Where's Murphy?" I shouted.
"In her office," Stallings stammered, "with you."
Murphy's office stood at the back of the room, with cheap walls and a cheap door that finally bore a genuine metallic nameplate with her name and title on it. I leaned back and drove my heel at the doorknob. The cheap door splintered, but I had to kick it again to send it swinging open.
Murphy sat at her desk, still wearing the clothes I'd last seen her in. She'd taken her hat off, and her short blonde hair was mussed. The circles beneath her eyes were almost as dark as bruises. She sat perfectly still, staring forward with her blue eyes set in an expression of horror.
I stood behind her, all in black - the same outfit I'd worn the night we'd stopped Kravos and his demon. The Nightmare looked like me. Its hands rested on either side of her face, fingertips on her temples - except that they had, somehow, pressed into her head, reaching down through skin and bone as though gently massaging her brain. The Nightmare was smiling, leaning down a bit toward her, head canted as though listening to music. I didn't know my face was capable of making an expression like that - serene and malicious and frightening.
I stared for a second in sheer horror at the weirdness of the sight. Then blurted, "Get the hell off of her!"
The Nightmare's dark eyes snapped up, sparkling with a cold, calm intelligence. It lifted its lips away from its teeth in an abrupt snarl. "Be thou silent, wizard," it murmured, steel and razor blades in its words. "Else I will tear thee apart, as I already have this night."
A little gibbering shriek of terror started somewhere down in my quivering belly, but I refused to give it a voice. I heard Rudy and Stallings coming behind me. I lifted the blasting rod and leveled it at the Nightmare's head. "I said to get off of her."
The Nightmare's mouth twisted into a smile. It lifted its hands away from Murphy, fingers just sliding out of her skin as though from water, and showed me its palms. "There is something thou hast forgotten, wizard."