Ghost Engine

Two thirds of a million years in the future, humanity has fissioned into numerous subspecies and expanded to occupy the Local Group of galaxies, largely through the agencies of a shadowy organization known as the Authority which holds a monopoly on the creation of artificial wormholes – the only practical mechanism for faster than light travel – and enforce it ruthlessly. The Authority are secretive, paranoid, and fabulously wealthy: needless to say, lots of sapients and AIs dislike this situation and want to change it...