Journalist and equestrian Wendy Williams chronicles the 56 million year history of horses, exploring how the biological affinities and differences between humans and horses can illuminate the bond we share, as well as what our longtime companions might think and feel. Williams visits the mountains of Wyoming to see free-roaming mustangs, witnesses the fluid grace of Vienna's famous Lipizzans, celebrates the wild takhi horses of Mongolia, contemplates how Garrano horses thrive in the rugged terrain of Galicia, and meets a family who rehabilitates abandoned mustangs on their New Hampshire farm.