Book excerpt: Post devolution Scotland never had a politician quite like Sir David Thorn - New Labour's first defector to the Tories and now the Shadow Minister for Constitutional Affairs. There's also the small matter of Thorn being something of a psychotic megalomaniac whose entire raison detre is to bring the whole devolution experiment to an abrupt and cataclsymic end. Corrupt politicians, bent cops, assassins, bigamists, Teletubbies and a horny Great Dane called Monty. Murder, mystery and mayhem in one sleazy bound - so what's new in the wild west of Scotland?