Maggie MacKenzie is a high school librarian who thinks her life is as orderly as the books on her shelves. She has a devoted husband, wonderful stepdaughter and loyal best friend. But her life is disrupted with the arrival of her granddaughter, Julia, who is growing up to be unusually perceptive.
As Maggie's connection to her granddaughter develops, she becomes haunted by dreams of two girls in seventeenth-century Scotland. Her dreams take her through a tragic era of Scottish history, and she grows mysteriously attached to the two girls. She first wonders whether this is a case of synchronicity, genetic memory or reincarnation. Ultimately, how it's happening ceases to matter as she discovers lives can be intertwined beyond the veil of time and space.
With the help of a former student turned astronomer, a girlfriend dealing with her own strange relationship, a feisty Italian neighbor and a young, hip clergyman, Maggie gathers the courage to journey where the moon meets the sun and earth-a place where truth is revealed in Plane of the Ecliptic.