Firstborn
A Time Odyssey, Book 3

Their first act was the Discontinuity, in which Earth was carved into sections from different eras of history, restitched into a patchwork world, and renamed Mir. Mirs inhabitants included such notables as Alexander the Great, Genghis Khan, and United Nations peacekeeper Bisesa Dutt. For reasons unknown to her, Bisesa entered into communication with an alien artifact of inscrutable purpose and godlike powera power that eventually returned her to Earth. There, she played an instrumental role in humanitys race against time to stop a doomsday event: a massive solar storm triggered by the alien Firstborn designed to eradicate all life from the planet. That fate was averted at an inconceivable price. Now, twentyseven years later, the Firstborn are back.