Only five still guard the borders between the worlds. Only five hold back what waits on the other side. Once the Oversight, the secret society that policed the lines between the mundane and the magic, counted hundreds of brave souls among its members. Now their numbers can be counted on a single hand. When a vagabond brings a screaming girl to the Oversight's London headquarters, it seems their hopes for a new recruit will be fulfilled - but the girl is a trap. As the borders between this world and the next begin to break  down, murders erupt across the city, the Oversight are torn viciously apart, and their enemies close in for the final blow.  This gothic fantasy from Charlie Fletcher (the Stoneheart trilogy) spins a tale of witch-hunters, supra-naturalists, mirror-walkers and magicians. Meet the Oversight, and remember: when they fall, so do we all.