Book excerpt: GET HIGH. FALL FAR. 'Big treat in store for fans. And if you're not a fan yet, why not?' Val McDermid 'Utterly nails the myth of the Swinging Sixties' Sun The Black Sheep The wayward son of a rising MP is mutilated and burnt in suspicious circumstances. The Honest Detective DS Cathal Breen dodges political embargo and death threats to pursue the case. The Rolling Stone Notorious art dealer Robert Fraser may provide the only clue - if only he will talk. And as Breen slips deeper into London's underground of hippies and heroin, he edges nearer to the secrets of those at the very top. Banished from a corrupt and fracturing system, he will finally be forced to fight fire with fire.