Worlds of the Timestream: The Interregnum Series, Book 2: The Friends by Richard J. Sutcliffe
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... In the decades following the deposition of James IV, High…