The Timestream is at least six known versions of Planet Earth arranged in hexagonal fashion. Each has different histories and societies, some different geologies, but all share the same physical laws and chronology. At critical historical points on one of the planets, crucial decisions result in two Earths with the same prior history but differing subsequent ones. Major events on neighbouring planets in the Timestream affect each other strongly...
Mara Meathe's engagement is the first domino in a string of events leading to her disgrace at court, her defection to the clan MacCarthy, the unravelling of the MacCarthy plot to destroy Tara, and her discovery of the truth about her father's death.
Elbon, known as The Builder on Meta, but as John Dominic on Tirdia, relocates to the Earth generated in the latest nexus, but it becomes lost in the Timestream.
Roger Hyland, the engineer responsible for rebuilding modern Tara rejects spiritual realities, despite his friends' earnest pleas. From Metan Manuscripts, the initial three critical historical nexus points are revealed, as are details of the first Builder and his age-old nemesis who plots time and again to either rule the earths...or destroy them.