Rat Race by Dick Francis

Matt Shore was an experienced pilot. He'd done it all. From big jets to flying in supplies to war zones. So when he gets a job ferrying high class punters around England's race courses he might be forgiven for expecting the quiet life. But then his plane explodes in a massive fireball. He could have been in it. Some quiet life.

Instead he's landed in the middle of a nightmare world where there is big money at stake. Very big money.

From then on he finds himself hurtling down a tortuous trail where people are not all they appear, and all around him is sudden bloody death...