detects Mavra

Mavra had given me her word of honor, but I had plenty of other enemies who would love to take a shot at me. I wasn't going to make myself an easy target. But standing around in the haunted graveyard in the dark started to make me nervous, fast.
"Come on," I muttered after a few minutes. "What's taking her so long?"
Mouse let out a growl so low and quiet that I barely heard it-but I could feel the dog's sudden tension and wariness quivering up through my maimed hand, shaking my arm to the elbow.
I gripped my staff, checking all around me. Mouse was doing much the same, until his dark eyes started tracking something I couldn't see. Whatever it was, judging from Mouse's gaze, it was getting closer. Then there was a quiet, rushing sound and Mouse crouched, nose pointed at my open grave, his teeth bared.
I stepped closer to my grave. Patches of mist flowed down into it from the green grounds. I muttered under my breath, took off my amulet, and pushed some of my will into the five-pointed star, causing it to glow with a low blue light. I draped the amulet over the fingers of my left hand while I gripped the staff in my right, and peered down into the grave.
The mist inside it suddenly gathered, congealed, and flowed into the form of a withered corpse-that of a woman, emaciated and dried as though from years in the earth. The corpse wore a gown and kirtle, medieval style, the former green and the latter black. The fabric was simple cotton-modern manufacture, then, and not actual historic dress.
Mouse's snarl bubbled up into a more audible rumbling snarl.
The corpse sat up, opened milk-white eyes, and focused on me. It lifted a hand, in which it held a white lily, and held it toward me. Then the corpse spoke in a voice that was all rasp and whisper. "Wizard Dresden. A flower for your grave."
“Mavra," I said. "You're late."


Dead Beat Chapter 2, Page 16-17