The Gatekeepers, as it is known in the US, is a series of five fantasy and suspense novels, written by English author Anthony Horowitz and published between 2005 and 2012.  It is an updated re-imagining of Horowitz's series, which the author had left unfinished in the 1980s. 

Included are:

• Raven's Gate


• Evil Star


• Nightrise


• Necropolis


• Oblivion