To the Hilt by Dick Francis

A brilliantly executed tale of top racing, big money and crime. Alexander Kinloch found solitude and a steady income painting in a bothy on a remote Scottish mountain. Until the morning the strangers arrived to rough him up, and Alexander was dragged reluctantly back into the real and violent world he thought he had left behind. Millions of pounds are missing from his stepfather's business. A valuable racehorse is under threat. Then comes the first ugly death and the end of all Alexander's doubts. For the honour of the Kinlochs he will face the strangers ... up to the hilt...