Power Of Five (The Gatekeepers)
Author: Anthony Horowitz
The pitch: The series focuses on five children: Matt, Pedro, Scott, Jamie, and Scarlett, a group of 14-year-olds destined to defeat mystical entities known as 'The Old Ones'.
The first book, 'Raven’s Gate', follows Matt, a petty thief, as he is sent to live in the small town of Lesser Mailing, where he uncovers a conspiracy to release a powerful 'Old One'.
The pedigree: The five children are introduced slowly over the series, with all five not featuring until the fourth book, Necropolis. Could be tricky for a film franchise - unless they can compress everything into one movie.
The fifth book has yet to be released, and Horowitz claims it make take years to finish.
Books in series: Four so far.
Web presence: 55,800 Googles.
Big-screen potential: The first book in Horowitz’ other series, the Alex Rider spy-novels, was adapted into the film Stormbreaker in 2006, although it was widely regarded as a disaster.
Next: Night World