The best way to describe the late Bill Nack’s passion for horse racing and his beloved Secretariat is to allow the master storyteller to do it himself. “Horses have a way of getting inside of you, and so it was that Secretariat became like a fifth child in our house, the older boy who was off at school and never around but who was as loved and true a part of the family as Muffin, our shaggy, epileptic dog,” he wrote.