The Builder - Worlds of the Timestream: The Interregnum, #6

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.