Spook StreetNow a major TV series, Slow Horses, starring Gary Oldman 'A terrific spy novel' Ian Rankin 'A modern masterpiece' Irish Times Twenty years retired from the Intelligence Service, David Cartwright still knows where all the bones are buried. But when he forgets that secrets are supposed to stay hidden, there's suddenly a target on his back. The 'Old Bastard' raised his grandson to be a hero, not a slow horse. Now, far from joining the myths and legends