Real-life husband and wife John McCallum and Googie Withers top the cast of Devil on Horseback. A racetrack drama, the film centers on the activities of natural-born jockey Moppy Parfitt (Jeremy Spencer). As he gains prominence on the track, Moppy becomes insufferably egotistical. His "win at all costs" policy ultimately results in the unecessary death of a horse. Much to the delight of horse owner Charles Roberts (McCallum) and trainer Mrs. Cadell (Withers), Moppy finally learns that there's something more to being a jockey than just talent. Prominently featured in the supporting cast is Liam Redmond as a bibulous ex-jockey named Scarlett O'Hara (sic!) ~ Hal Erickson, All Movie Guide