Fortune's Stroke: Belisarius Series, Book 4 (Hardcover) Eric Flint & David Drake

Aide, a human soul embodied in a jewel, journeys back in time to join forces with Belisarius, the greatest general of the sixth century, to stop Link, an evil supercomputer that is using its vast powers to rewrite history to create the powerful, technologically advance Malwa Empire. 

April 2024