Tiegn and the Living Stones

It is about 2000 BC; Stonehenge is in mid-construction. The clan chief dies nominating Tiegn, a woman, as the next chief. Her disgruntled brother tries to join forces with a renegade chief of another clan to capture the woman and rule in her place. But in this lethal battle for power, he does not have the sword of authority, and all this as they are trying to build the stone circle.