Albert (Jeremy Irvine) and his beloved horse, Joey, live on a farm in the British countryside. At the outbreak of World War I, Albert and Joey are forcibly parted when Albert's father sells the horse to the British cavalry. Against the backdrop of the Great War, Joey begins an odyssey full of danger, joy and sorrow, and he transforms everyone he meets along the way. Meanwhile Albert, unable to forget his equine friend, searches the battlefields of France to find Joey and bring him home.