At the turn of the 21st century, Dr. Sara Roberts, a newly appointed professor of a fictitious Ivy League university in Cambridge, Massachusetts, is entranced by her work colleague, the enigmatic Dr. Koleen Edwards. The two form a fast friendship until Dr. Edwards asks Sara out on proper date in the fall. Though their relationship starts out smooth, a menacing letter sent to Dr. Roberts shifts their bond in a not-so-typical way. After a fatal accident in late December, it is revealed to Sara that Dr. Edwards is a living historical figure, unaged and unmarked with time. Dr. Edwards goes on to explain her past lives to Sara, telling her that until the mid-1970s, she was living her life as a man. Sara, though shocked to hear the revelation, does not doubt the love of her life and her various past roles. In the start of the New Year, the professors travel abroad to Wales to visit the Edwards' impressive homestead in rural North Wales. There, Sara sees firsthand the history behind Dr. Edwards' past lives and hears tales of the past from her various relatives. Sara seemingly wakes from a dream and finds out that all Dr. Edwards had told her was untrue, and struggles with reality, deeming whether or not this is just another cover-up from a family that has been tested for over seven hundred years.