Necropolis is a fantasy novel by British writer Anthony Horowitz. It is the fourth novel in his Power of Five series. The book is set in London, Peru, Miami, Ukraine, Macau and Hong Kong. The book was released in the United Kingdom and Australia on 30 October 2008. It is a rewrite of the corresponding Day of the Dragon, released 1989 in Horowitz's Pentagram series. A marked difference between original is evidenced by a lead character, Will, being replaced with a female counterpart, Scarlett.