Circle of Days (2025) is a historical novel set in Neolithic Britain by British author Ken Follett. The novel imagines the creation of Stonehenge through the eyes of ordinary people as well as the various communities that lived in Britain 2,500 years BCE. The novel explores The Power of Pursuing a Common Task, The Cyclical Nature of Violence, and The Formation of Competing Cultures.

This guide is based on the 2025 Quercus edition.

Content Warning: The source material and this guide feature depictions of death, graphic violence, animal death, child death, child abuse, sexual abuse, physical abuse, and sexual content.

Plot Summary

The novel is set in Britain, around the year 2,500 BCE. A flint miner named Seft travels with his family across the Great Plain to the Midsummer Rite. Seft’s father, Cog, is a violent man. He encourages Seft’s brothers, Olf and Cam, to bully him. Seft is desperate to escape their cruel treatment. He dreams of Neen, a young herder girl whom he met the previous year at the Spring Rite. As his family trades, Seft slips away to find Neen. 

Neen’s younger sister, Joia, takes him to Neen. Seft is welcomed warmly by Neen’s family and their hospitality amazes him. They are even kind to a young farmer girl named Pia, who is friends with Neen’s brother Han, and Pia’s aggressive cousin, Stam. Seft learns that Neen’s father, Olin, died when she was young. Neen, Joia, and Han have been raised by their mother, Ani, who is one of the Elders of the herder people. Ani has never had an interest in any other man after Olin’s death. As night falls, Seft and Neen have sex and fall asleep together. In the morning, Seft is eager to discuss their future as a couple, though Neen is more cautious.

Following the Rite where the Priestesses sing and dance, Seft returns to his family. His father orders him to guard and clean the pit. Seft refuses, so Cog beats him. Seft crawls away, humiliated. The herder Elders judge the case; they banish Cog and his sons. That evening, a revel takes place, involving people from different communities pairing up to have sex. Joia finds herself not attracted to boys. Instead, she kisses an older woman, Kae, and reflects on her sexuality. 

Seft wakes up near his family’s mining pit. He invents a way to fix the door’s ailing lintel, but his family are unimpressed. A fellow miner named Wun pays a visit. Wun shows an interest in hiring Seft for his ingenuity, but Cog is insistent that Seft remain with his family. Seft realizes that he must run away from his father and brothers. 

After the Rite, the farmer women return to Farmplace. There, they discover that the leader of the farmers, Troon, has ordered the men to plow up the Break, a gap between wooden areas that allows the herders’ cattle to access the river. Pia’s mother Yana realizes that Troon’s actions will intensify the frayed relations between farmers and herders. Troon insists that the farmers must have more arable land so that they can grow more food for their increasing population. He believes that the herders are naturally weak and cowardly, so will not respond. The herder Elders—including Ani, Scagga, and Keft—search for a diplomatic solution. 

Meanwhile, Joia organizes an adventure. She and her friends spy on the secretive priestesses. Han follows his older sister, leading to the girls being caught. Soo, the High Priestess, interrogates Joia. Rather than punishing her, she offers her the opportunity to join the priestesses. Joia is fascinated by the priestesses’ rituals and practices. She hopes to convince Ani to allow her to join them. 

Elsewhere, Seft runs away from his family and joins Wun’s team of miners. He is amazed by their friendliness compared to his family. When Cog tries to bring Seft back, Wun intervenes. That night, Cog sends Olf to kidnap Seft, but Seft fights him off. Wun and the other miners send Seft’s family away. When the excavation of Wun’s pit is finished, Seft opts against going with the crew to the next mine. Instead, he chooses to seek out Neen in Riverbend. At this time, Neen reveals to Joia that she is pregnant with Seft’s child. She tells her sister that she loves Seft. 

Ani discovers that the aggressive Scagga has told his followers to take revenge on the farmers for destroying the Break. Scagga’s followers burn the farmers’ crops, prompting the farmers to attack the priestess’s Monument. Joia agrees with Soo that the Monument should be rebuilt in stone. Though Seft has ideas of how to tackle this challenge, the Elders deem it impossible. 

Ten Midwinters pass and a severe drought affects the Great Plain. Now together, Seft and Neen are parents to three children, and Seft is the leader of the craftsmen known as the cleverhands. Their peaceful lives are disrupted by the return of Seft’s brothers. Visibly destitute, Cam and Olf beg their younger brother to help them. Their father is dead, they say, and they do not know how to start a new mine. Seft helps them to find a new location for a mine and visits the stone quarry to rethink his ambitious project. When Yana’s husband dies, farmer culture demands that she find another husband. When she cannot, Troon assigns her to his teenage son, the arrogant Stam. Life with Stam is miserable and Pia is horrified that her mother is made to suffer by Troon. 

Woodlanders live in the woods near the Great Plain. The brothers Bez and Fell fear that their tribe will starve, so they visit the Monument to find out when the deer will migrate. Han takes them to Joia, who uses her priestess knowledge to tell them the date. The woodlanders are very thankful. During this time, Soo dies and a new high priestess must be chosen. Joia competes with Ello; though the priestesses prefer Joia, they are doubtful that Joia can rebuild the Monument in stone, so they chose Ello.

Pia is in love with Han but fears Troon will not let them be together. They organize secret trysts and, when Pia becomes pregnant, they plan to run away together. They flee and hide with the woodlanders, then find a remote island where they can be together. Troon and Stam search for Pia and Han but struggle to find them. Pia gives birth to a baby but fears that she and Han will need to return to the herders to raise the child. Fell visits them with a gift; Stam appears, killing Han and Fell. He threatens the baby and forces Pia to return to the farmers. The woodlanders learn that Stam killed Fell; Bez, their leader, captures and executes Stam to restore balance. 

Tensions between the farmers and herders continue. When the herders try to make a new break following a stampede, Scagga accidentally burns down the wood where the woodlanders live. Troon immediately ploughs the ashes for new farmland; he refuses to support the woodlanders, who face starvation. They begin to steal cows from the farmers. Eventually, Troon organizes a slaughter of the woodlanders. In response, Bez takes the last of his people to the Midwinter Rite, where they kill many people and burn the Monument. The woodlanders are all killed or lost in the aftermath.

The massacre threatens the popularity of the Rites. Joia becomes high priestess, promising to rebuild the Monument in stone to inspire people. She and Seft devise a method of dragging stones from the distant quarry to the Monument with the help of hundreds of people, whom they believe will volunteer while attending the Rites. In spite of internal resistance from Scagga and external threats from Troon, they begin to put their plan into action. They begin by dragging one giant stone to the Monument. In spite of interference from Troon’s farmers, they manage to do so. During the trip, Joia begins to fall in love with a woman named Dee, but she struggles to vocalize her love and to balance her responsibility with her newfound desire.

The first stone is a success, so Joia plans to bring nine more to the Monument. This process will be quicker, she is sure, as they have learned so much. At the same time, Pia fears that Troon is planning a war. She is locked inside her house with her mother and baby, as well as her new partner, Duff. During the mission to bring more stones, Joia and Dee eventually find a way to be together. Troon leads an army of farmers in an attack against the mission, but they are defeated. Many farmers die, leaving Pia with an opportunity to reconstruct the farmer community in a way that empowers women and works diplomatically with the herders. Joia brings the nine additional stones; she and Seft are hailed as heroes as the stones are put into place. Seft’s brothers briefly return and, in spite of his kindness, they rob his family. Neen makes him promise to cut them out of his life.

After 15 years pass, an aging Ani gazes with wonder at the stone Monument and praises her daughter and Seft for completing the wonder. People come from distant lands to view it.