Royals on the Galactic Tunnel Network — E.M. Foner

The Ladies in Waiting are done waiting for Earth to get its governmental act together. A delegation that includes Georgia's mother is on its way to the Vergallian homeworld to petition the Council of Queens to send princesses to rule Earth. Thanks to derivative treaties, the implications for the tunnel network reach far beyond humanity, and EarthCent Intelligence and the Galactic Free Press assign John and Ellen to keep an eye on things, with Semmi attending as guest royalty. Larry and Georgia can't be far behind, and Myort is bound to show up anywhere there's action.