The Silver Citadel

Nightrise is the third book in The Power of Five series, written by Anthony Horowitz. It was published and released in the UK on 2 April 2007 by Walker Books Ltd. It is preceded by Evil Star, released in 2006, and followed by Necropolis, which was released on 30 October 2008. The title is a reference to both the fictional organisation represented in the book, and the Old Ones' eclipsing presence on Earth.