In this episode, Richard is on a three-day mountain bike expedition from the border to the coast. It's not about getting from A to B - instead, his route is off-road and packed with tough terrain as it criss-crosses Wales's wildest areas.His 140-mile journey begins at Offa's Dyke on the ancient disputed border between Wales and England. He encounters the beautiful yet remote Elan Valley, before experiencing adrenaline-filled downhill trails on a cutting-edge four-wheeled 'gravity bike'. Finally, with the weather and visibility against him, he faces the potentially dangerous summit of the mighty Cadair Idris, before heading for the finishing line at Barmouth Beach.Along the way, Richard meets riders of different ages and abilities, incredible characters, all connected by a love of adrenaline-filled, off-road adventure.