Anthropologist, Alice Roberts, and archaeologist, Neil Oliver, embark on an expedition to unravel the enigmatic ancient Celtic civilization; tracing their footsteps across various regions.

This three-part documentary discovers the origins and beliefs of the Celts in artifacts and human remains across Europe. What emerges is not a portrait of wild people on the western fringes of Europe, but a highly sophisticated tribal culture that influenced vast areas of the ancient world - and even Rome.