"Stop!" one of the officers shouted, panting. "Stop that man!"

The hair on the back of my neck prickled. The man running toward me kept on screaming, high and terrified, his voice a long and uninterrupted peal of … something. Terror, panic, lust, rage, all rolled up into a ball and sent spewing out into the air through his vocal cords.

I had a quick impression of wide, staring eyes, a dirty face, a denim jacket, and old jeans as he came down the shadowy hallway. His hands were behind his back, presumably held there by cuffs. He wasn't seeing the hall he was running through. I don't know what he was looking at, but I got the impression that I didn't want to know. He came hurtling toward me and the stairs, blind and dangerous to himself.

It wasn't any of my business, but I couldn't let him break himself apart in a tumble down the stairs. I threw myself toward him as hard as I could, attempting to put my shoulder into his stomach and drive him backward in a football-style tackle.

There is a reason I got cut every year during high school. I rammed into him, but he just whuffed out a breath and spun to one side, into a wall. It was as though he hadn't seen me coming and had no realization that I was there. He just kept staring blindly and screaming, careening off the wall and continuing on his way, toward the stairs. I went down to the floor, my head abruptly throbbing again where the unknown tough had rapped me with a baseball bat last night.

One good thing about being as tall as I am—I have long arms. I rolled back toward him and lashed out with one hand, fingers clutching. I caught his jeans at the cuff and gave his leg a solid sideways tug.

That did it. He spun, off-balance, and went down to the tile floor. The scream stopped as the fall took the wind from him. He slid to the top of the stairs and stopped, feebly struggling. The officers pounded past me toward him, one going to either side.

And then something strange happened.

The young man looked up at me, and his eyes rounded and dilated, until I thought they had turned into huge black coins dotted onto his bloodshot eyeballs. His eyes rolled back into his head until he could hardly have been able to see, and he started to shout in a clarion voice.

"Wizard!" he trumpeted. "Wizard! I see you! I see you, wizard! I see the things that follow, those who walk before and He Who Walks Behind! They come, they come for you!"

"Jesus Christ on a crutch," the shorter, rounder officer said, as they took the man by his arms and started dragging him back down the hall. "Junkies. Thanks for the assist, buddy."

I stared at the man, stunned. I caught the sleeve of the taller officer. "What's going on, sir?" I asked him.

He stopped, letting the prisoner hang between him and his partner. The prisoner's head was bowed forward, and his eyes were still rolled back, but he had his head turned toward me and was grinning a horrible, toothy grin. His forehead was wrinkled oddly, almost as though he were somehow focusing on me through the bones of his browridges and the frontal lobes of his brain.

"Junkie," the taller officer said. "One of those new ThreeEye punks. Caught him down by the lake in his car with nearly four grams of the stuff. Probably more in him." He shook his head. "You okay?"

"Fine, fine," I assured him. "ThreeEye? That new drug?"

The shorter officer snorted. "One that's supposed to make them see the spirit world, that kind of crap."

The taller one nodded. "Stuff hooks harder than crack. Thanks for the help. Didn't know you were a civilian, though. Didn't expect anyone but police down here this time of day."

"No problem," I assured him. "I'm fine."

"Hey," the stouter one said. He squinted at me and shook his finger. "Aren't you the guy? That psychic consultant Carmichael told me about?"

"I'll take the fifth," I said to him with a grin that I didn't feel. The two officers chuckled and turned back to their business, quickly shouldering me aside as they dragged their prisoner away.

He whispered in a mad little voice, all the way down the hall. "See you, see you, wizard. See He Who Walks Behind."

I returned to my chair in the waiting area at the end of the row of cubicles and sat down, my head throbbing, my stomach rolling uncomfortably. He Who Walks Behind. I had never seen the junkie before. Never been close to him. I hadn't sensed the subtle tension of power in the air around him that signified the presence of a magical practitioner.

So how the hell had he seen the shadow of He Who Walks Behind flowing in my wake?

For reasons I don't have time to go into now, I am marked, indelibly, with the remnants of the presence of a hunter-spirit, a sort of spectral hit man known as He Who Walks Behind. I had beaten long odds in surviving the enemy of mine who had called up He Who Walks Behind and sent him after me—but even though the hunter-spirit had never gotten to me, the mark could still be seen upon me by those who knew how, by using the Third Sight, stretching out behind me like a long and horribly shaped shadow. Sort of a spiritual scar to remind me of the encounter.

But only a wizard had that kind of vision, the ability to sense the auras and manifestations of magical phenomena. And that junkie had been no wizard.

Was it possible that I had been wrong in my initial assessment of ThreeEye? Could the drug genuinely grant to its users the visions of the Third Sight?

I shuddered at the thought. The kind of things you see when you learn how to open your Third Eye could be blindingly beautiful, bring tears to your eyes—or they could be horrible, things that made your worst nightmares seem ordinary and comforting. Visions of the past, the future, of the true natures of things. Psychic stains, troubled shades, spirit-folk of all description, the shivering power of the Nevernever in all its brilliant and subtle hues—and all going straight into your brain: unforgettable, permanent. Wizards quickly learn how to control the Third Eye, to keep it closed except in times of great need, or else they go mad within a few weeks.

I shivered. If the drug was real, if it really did open the Third Eye in mortals instead of just inflicting ordinary hallucinations upon its users, then it was far more dangerous than it seemed, even with the deleterious effects demonstrated by the junkie I had tackled. Even if a user didn't go mad from seeing too many horrible or otherworldly things, he might see through the illusions and disguises of any of a number of beings that passed among mankind regularly, unseen—which could compel such creatures to act in defense, for fear of being revealed. Double jeopardy.

"Dresden," Murphy snapped, "wake up."

I blinked. "Not asleep," I slurred. "Just resting my eyes."

She snorted. "Save it, Harry," and pushed a Styrofoam cup into my hands. She'd made me coffee with a ton of sugar in it, just the way I like, and even though it was a little stale, it smelled like heaven.

"You're an angel," I muttered. I took a sip, then nodded down the row of cubicles. "You want to hear this one in your office."

I could feel her eyes on me as I drank. "All right," she said. "Let's go. And the coffee's fifty cents, Harry."

I followed her to her office, a hastily assembled thing with cheap plywood walls and a door that wasn't hung quite straight. The door had a paper sign taped to it, neatly lettered in black Magic Marker with LT. KARRIN MURPHY. There was a rectangle of lighter wood where a plaque had once held some other hapless policeman's name. That the office never bothered to put up a fresh plaque was a not-so-subtle reminder of the precarious position of the Special Investigations director.

Her office furniture, the entire interior of the office, in fact, was a contrast with the outside. Her desk and chair were sleek, dark, and new. Her PC was always on and running on its own desk set immediately to her left. A bulletin board covered most of one little wall, and current cases were neatly organized on it. Her college diploma, the aikido trophies, and her marksman's awards were on the wall to one's immediate right as you entered the office, and sitting there right next to your face if you were standing before her desk or sitting in the chair in front of it. That was Murphy—organized, direct, determined, and just a little bit belligerent.