Many urban-fantasy novels are told via a first-person narrative, and often feature mythological beings, romance, and female protagonists who are involved in law enforcement or vigilantism. Laurell K. Hamilton's Anita Blake series—which follows the investigations of a supernatural Federal Marshal during paranormal cases—has been called a substantial and influential work of the genre. Kim Harrison's Rachel Morgan novels, also regarded as inspirational works, feature a bounty-hunting "witch-born" demon who battles numerous supernatural foes. Multi-genre offerings combine urban fantasy with other established forms (e.g.: police procedurals, as presented in the Peter Grant stories of Ben Aaronovitch, or the Charlie Madigan series, by Kelly Gay, which explores challenges a police officer faces while trying to balance her paranormal cases with life as a single mother).