[1] Major Randolph McIvor has one son, Lin, helping train his horses and another, Sandy, riding them.

Their stable has fallen on hard times, but they are preparing their promising new thoroughbreds Encino and Tarzana for the Kentucky Derby.

Armistead has a star horse called Blue Grass that also will be a Derby contender.

What no one but Pat knows is that Blue Grass's sire was a different horse than the one originally intended.

A trainer, Layton, files a formal complaint after Blue Grass wins the Derby, claiming that the winner's pedigree can not be proven.