The Danger by Dick Francis

Kidnapping is Andrew Douglas's business: they take them, he finds them. But it isn't so simple when Alessia Cenci, golden-girl jockey, disappears, followed by the young child of a derby winner and the senior steward of the Jockey Club. From Italy to England to Washington, D.C., Andrew's caseload is suddenly, violently overflowing. And he must fight triply hard to keep his own name off the growing list of victims. . . .