The Herald

The future of Earth depends on unwanted misfits.

Argrenn and his wife were saved from Earth's destruction by the Vrelth and transported to Geoe, a world run with gaming rules. They need to get a message out to other human planets but the Vrelth turned Geoe into a war zone.
The only protection they have is their new friends and the rules of the game - none of which they know.
Either they learn to play the game or Earth is doomed.