Rachel Duncan, a Montana rancher, has led a self-sufficient life and kept her complications of the heart to a minimum. She is as tough as her horses and believes nothing can stop her from winning the one-hundred-mile in one day horse race, the Tevis Cup. She has a horse who can do the job, the Arabian mare, Kestrel. The element of the team she isn't so sure of is her new veterinarian, Dr. Margaret Carson. Margaret proves herself to the reluctant Rachel, broadening her vistas to discover a tender side, one capable of loving and being loved.