But a monitoring spell wouldn’t be the kind of thing that could lie dormant. It had to actually be “looking” around all the time. That meant a constant, modest expenditure of energy, which would in turn be exposed and vulnerable to sunrise. Land mine–type spells were a lot easier, like my protective spells, only with more kaboom in them. I wasn’t surprised that I didn’t find any of those outside the hideout. Few people would host a picnic underneath the overpass, but it was Chicago, and all sorts of folks would be through this area during the day. Random people being horribly incinerated would certainly draw the attention of the local authorities, and possibly that of the White Council. The Grey Ghost didn’t seem to be an idiot. No death traps were left lying around where some schoolkid or bum might stumble into them.

I wouldn’t have set up like that, either. It made far more sense for such sentry spells to be laid down underground, deep enough for the steady presence of the earth to shield the spell energy from disruption.

The Grey Ghost was smart. Things would get interesting about fifteen or twenty feet down.

I finished my last circuit of the site and moved to the door. I reached out a hand and stopped with my palm about an inch away from the metal. I sensed something subtle but there, like the attractive field around an old, weak magnet. I frowned and focused on it, finding a spell of a composition unlike anything I’d ever seen before.

It was something subliminal, sending out a kind of beckoning energy that I wouldn’t have noticed had I not been specifically looking for something like it. It would otherwise have been buried in the background energy of the city and its inhabitants. I stretched out a hand to touch the stream of energy flowing steadily outward. It oozed over the surface of my skin, a crawling sensation that made me shudder.

It’s smarter not to play around with unfamiliar magic. Besides, I had other things to do. I lowered my hand and stepped toward the source of the music I’d begun hearing in my head at some point. There was little sense wasting more time up on the surface. And I hadn’t heard that song in forever, but I could still sing along. I started humming and—

—and stopped myself with my nose about half an inch from the steel door.

I broke out into a cold sweat.

Hell’s bells. That magic hadn’t been heavy-duty, but it had been puissant. A few seconds after touching it, I had almost walked blindly and mindlessly through the door and into whatever reception was prepared for intruders on the other side. I couldn’t know exactly what was over there without getting a look, but it sure as hell wasn’t a gift basket and a bottle of wine.

I stepped back from the door and the siren spell with what I felt was a properly Darwinian appreciation of the danger it represented. Oh, it might not blow you up like the defensive wards I’d had on my apartment, but a scalpel can open up your arteries just as readily as a sword. In some cases, more so. I shivered and clutched my arms to my belly.