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

Have aliens spent the last century looting Earth of its treasures?Ellen, the Earth Syndication Coordinator for the Galactic Free Press, and her partner, John, EarthCent Intelligence's roving troubleshooter, are back with Semmi the gryphon to investigate. Larry, finding himself stuck as the Minister of Trade for the nascent Human Empire, starts making the rounds of sovereign human communities, while his freelance reporter partner, Georgia, trades in educational toys and tries to land a big interview. Can the five of them put their heads together and solve the literal crime of the century?