High Quality Content by WIKIPEDIA articles! The Enemy is a post-apocalyptic young adult horror novel written by Charlie Higson. The book takes place in London after a worldwide sickness has infected adults turning them into something akin to zombies. It was published by Puffin Books in the UK on 3 September 2009 and by Disney-Hyperion in the U.S. on 11 May 2010.The Enemy is the first in a planned series of six. The second novel, titled The Dead, was published on 16 September 2010. The third novel in the series, titled The Fear, was published on 15 September 2011.