Cluster

There are a few ways to travel in this future with conflict between humans and aliens. Teleportation, which costs a hell of a lot. Freeze the people and stick them on a ship, which is dangerous and unreliable, or use Kirlian transfer, which basically imprints a personality on one of the locals. The latter, to be effective, is limited to people with high Kirlian ratings. One such is chosen to do a job, and he soon finds himself pursued by an alien counterpart of similar ability. They soon find opposites with high aureas are kind of hot.