Ailsa is the maternal granddaughter of the head Druid who organized the construction of the great stone circle on the Isle of Arran in the Atlantic Ocean, situated between modern day Ireland and Scotland. She struggles to wield the power she has as a Druid, as she is forced to explain the imminent revolution that their stone-centered world is about to face. As a driven and romantic young woman in 1800 BC, she is simultaneously torn between an oath to her first love and her responsibility to her arranged marriage to a foreigner. Will Ailsa abandon her destiny for her heart's adventure or will she stay to lead her tribe into this new age of alchemy? Meanwhile, in the modern age, Edie, named after her grandfather's best friend, Edison, is a serial loner, living a solitary life as an archaeologist in Northern Ireland. After a visit from her best friend, she is inspired to finally finish the Neolithic stone circle research that her deceased professor and mentor left to her. As she journeys through her grief, she discovers new truths behind the mysteries of the stone circle ritual complex, previously unknown to the experts, and she eventually confronts the truth that her professor wanted her to discover about herself. 1800 BC is the first novel in a trilogy called The Aition, which spans one thousand years of the archaeological record, illuminating the stories of the ancient Celts through vivid characters who built the foundations of the Celtic culture we celebrate today, and whose hopes and fears were not unlike our own.