Pandaemonium is Christopher Brookmyre's thirteenth novel. It was published in the United Kingdom on 13 August 2009.^[1]

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The senior pupils of St Peter's High School are on retreat to a secluded outdoor activity center, coming to terms with the murder of a fellow pupil through the means you would expect: counselling, contemplation, candid discussion and even prayer; not to mention booze, drugs, clandestine liaisons and as much partying as they can get away with. Not so far away, the commanders of a top-secret military experiment, long-since spiraled out of control, fear they may have literally unleashed the forces of Hell. Two very different worlds are on a collision course, and will clash in an earthly battle between science and the supernatural, philosophy and faith, civilization and savagery.