After writing an unfortunate article under a pseudonym (Machiavelli, Jr.) and having it published in a prestigious journal read by diplomats, Stephen Silk is to be banished from the Solar League's capitol on Luna for a time.

The briefing books that were given to him tell him little about the New Texans and their culture and the contents of the trunk that was put aboard the ship for him appall him: contrary to the practices of the Consular Service, he will be obliged to dress in native costume and to carry a pair of automatic pistols in ejection holsters.

At the barbecue Silk meets Gglafrr Ddespttann Vuvuvu, the ambassador of the z'Srauff, humanoid aliens that look like they evolved from dogs.

Part of Silk's mission involves convincing the New Texans to join the Solar League so that the Space Navy can base ships near their planet to counter the threat from the z'Srauff.

As amicus curiae Silk introduces evidence to show that the Bonneys assassinated Ambassador Cumshaw at the behest of the z'Srauff.