I shook my head. “You’re thinking of ley line magic. And it’s Latin, not magic words. Ley line witches draw their power right from the line and need the trappings of ceremony to control it. I’m an earth witch.” Thank God. “My magic is from ley lines, too, but it’s naturally filtered through plants. If I was a black witch, much of it would come through animals.”

Feeling as if I was back doing my graduate lab-work exam, I dug in the silverware drawer for a finger stick. The sharp prick of the blade on my fingertip was hardly noticeable, and I massaged the required three drops into the potion. The scent of redwood rose thick and musty, overpowering the camphor smell. I had done it right. I had known I had.

“You put blood in it!” he said, and my head came up at his disgusted tone.

“Well, duh. How else was I supposed to quicken it? Put it in the oven and bake it?” My brow furrowed, and I tucked a strand of my hair that had escaped my bow back behind my ear. “All magic requires a price paid by death, Detective. White earth magic pays for it by my blood and killing plants. If I wanted to make a black charm to knock you out, or turn your blood to tar, or even give you the hiccups, I’d have to use some nasty ingredients involving animal parts. The really black magic requires not just my blood but animal sacrifice.” Or human or Inderlander.

My voice was harsher than I had intended, and I kept my eyes down as I measured out the doses and let them soak into the redwood disks. Much of my stunted career at the I.S. involved bringing in gray spell crafters—witches that took a white charm such as a sleep spell and turned it to a bad use—but I’d brought in black charm makers as well. Most had been ley line witches, since just the ingredients needed to stir a black charm were enough to keep most earth witches white. Eye of newt and toe of frog? Hardly. Try blood drawn from the spleen of a still-living animal and its tongue removed as it screamed its last breath into the ether. Nasty.

“I won’t make a black charm,” I said when Glenn remained silent. “Not only is it demented and gross, but black magic always comes back to get you.” And when I had my way, it involved my foot in his gut or my cuffs on his wrists.

Choosing an amulet, I massaged three more drops of my blood onto it to invoke the spell. It soaked in quickly, as if the spell pulled the blood from my finger. I extended the charm to him, thinking of the time I had been tempted to stir a black spell. I survived, but came away with my demon mark. And all I’d done was look at the book. Black magic always swings back. Always.