On this journey, Martin wants to find out how the horse became so important to us. How did we manage to tame such a huge, nervous prey animal and make it both our servant and our friend? At home on his farm in Dorset, Martin rides his own horse Chester and explains how he was drawn into the equine world by his wife and daughter. To find out what makes horses tick Martin flies to Dubai, to the grand opening of the £1.7 billion Meydan racecourse. There he meets champion jockey Frankie Dettori and top trainer Luca Cumani, for a fascinating insight into horse psychology. He then heads further east to the heart of Mongolia, where he tracks down the one remaining horse breed that has never been tamed by man: the Przewalski horse, known in Mongolia as the Takhi.