Break In — Dick Francis

Blood ties can mean trouble. Kit Fielding, proud heir to tradition and sporting hero to legions of fans, learns this lesson to his rapidly mounting regret. His close, even telepathic kinship with his twin sister, Holly, draws him into a crusade to save her marriage from ruinous scandal. But his intercession--both on and off the track--proves more costly than he'd imagined, thrusting him into a deadly contest of wit and will with a ruthless media czar, a black-hearted robber baron, and an unexpectedly violent adversary far too close to home for comfort....