Bad language. Scatalogical humour. Razor wit. Convoluted plot. High readability. It's the new Christopher Brookmyre novel. The senior pupils of St Peter's High School are on retreat to a secluded outdoor activity centre 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 spiralled 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 civilisation and savagery. The bookies are offering evens.