Working as a Hound—tracing illegal spells back to their casters—has taken its goll on Allison Beckstrom. But even though magic has given her migraines and stolen her recent memory, Allie isn't about to quit. Then the police's magic enforcement division asks her to consult on a missing persons case. But what seems to be a straightforward job turns out to be anything but, as Allie finds herself drawn into the underworld of criminals, ghosts, and blood magic.