Lone Star Planet by H. Beam Piper

The next morning, which was Saturday, I put Thrombley in charge of the routine work of the Embassy, but first instructed him to answer all inquiries about me with the statement, literally true, that I was too immersed in work of clearing up matters left unfinished after the death of the former Ambassador for any social activities. Then I called the Hickock ranch in the west end of Sam Houston Continent, mentioning an invitation the Colonel and his daughter had extended me, and told them I would be out to see them before noon that same day. With Hoddy Ringo driving the car, I arrived about 1000, and was welcomed by Gail and her father, who had flown out the evening before, after the barbecue.

Hoddy, accompanied by a Ranger and one of Hickock's ranch hands, all three disguised in shabby and grease-stained cast-offs borrowed at the ranch, and driving a dilapidated aircar from the ranch junkyard, were sent to visit the slum village of Bonneyville. They spent all day there, posing as a trio of range tramps out of favor with the law.