Martin Clunes follows humans' relationship with horses through the ages, exploring the animal's role in warfare, ceremony, farming, transport, sport and leisure. Martin begins on his farm in Dorset, where he introduces his equine family, before travelling to Dubai for the grand opening of the Meydan Racecourse and to hear from jockey Frankie Dettori and trainer Luca Cumani. He also visits Mongolia and the South of France, and meets horse whisperer Monty Roberts.