Constable Young Books, 1961
As Pride of the Moor
Doubleday, New York, 1962, cover art Reisie Lonette
Mark finds an abandoned racehorse on the moor, and eventually manages to persuade his poor farming family to let him keep it. The mare is in foal, and the colt she produces is special. Mark grows up with the foal, who becomes a steeplechaser. His training gradually brings the community together, until the colt, Question Mark, enters the Grand National. Be warned: the book does not have an altogether happy ending.