Set in a former mining village in Wales, Dark Horse is the inspirational true story of Jan Vokes and her group of local friends who decide to take on the elite 'sport of kings' and breed themselves a racehorse. Raised on a slagheap allotment, their foal becomes a source of inspiration and hope.

Filmmaker Louise Osmond follows the story of a group of friends and neighbours in a small Welsh town who pool their modest resources to invest in a racehorse they dub Dream Alliance, and soon find themselves breaking social barriers by competing against some of the wealthiest horse owners in the UK.