They call him The Emperor of West Ditch. Most of the residents of Murder Mews think he's just another mind-addled loner accosting random passers by with improbable stories of bloodshed. But he walks with the gait of a practiced fighter, and he watched the alleys with a sharp gaze. Once the Emperor was the best beast catcher in the city. And while his sanity is gone, he still knows more about the nightly hunting rituals of rooftop vampires and the diet of the giant gutter vole than anyone else alive.