Philip Purser-Hallard is the author of a trilogy of urban fantasy thrillers beginning with The Pendragon Protocol, and the editor of a series of anthologies about the City of the Saved. As well as writing various other books and short stories, including Sherlock Holmes: The Vanishing Man for Titan Books, Phil edits The Black Archive, a series of monographs about individual Doctor Who stories published by Obverse Books. He tweets @purserhallard.