Golden Sovereign by Dorothy Lyons

Two previous girl and horse stories introduced Connie McGuire and her white mare, Silver Birch, and her outlaw Midnight Moon. Now, in Silver’s first colt, a palomino, Connie sees her dream of starting a famous stud farm, bearing results. A mystery runs through the story – the mystery of the ancestry of a sad bit of horse flesh that Connie bought out of pity (and with a faint hope that the mare had… seen better days). What with this constant building to a climax – and sound riding and training and showing material – and Wesley Dennis line drawings, Golden Sovereign will be a winner.