Circle of Days by Ken Follett

Set around 2500 BCE, Circle of Days explores the mysterious story of Stonehenge. Seft comes from a family of flint miners. The work is grueling and his father is harsh. When Seft meets Neen, a girl from a family of herders, he notices something different within her family - love and kindness. When the farmers secretly take over land traditionally used for herding animals, Neen’s mother fears the outrage could spark a war between the two communities. Though she has never experienced war herself, she remembers the stories her parents told about a past conflict between the herders and the woodlanders. Joia, Neen’s younger sister, is fascinated by the priestesses who guard the secrets of the sky. When the High Priestess teaches her a new way of counting - using discs instead of body parts - Joia becomes deeply intrigued and begins to understand her true calling. At this time, the Great Plain is divided among three tribes: herders, farmers, and woodlanders. Mistrust among them is grow...