The longest mail route in the U.S. runs more than 300 miles through Wyoming’s unforgiving Red Desert, and Blair McGowan, the delivery person, has gone missing.

Her disappearance is odd, not just because McGowan has always been reliable but because her personal delivery vehicle, a 1968 International Travelall that looks like a hearse and has a quarter of a million miles on it, was left behind.

Authorities in Sweetwater County haven’t made any progress, so Mike Thurman, the postal inspector, asks Walt Longmire, sheriff of (fictional) Absaroka County, to find her. The desert is way out of Longmire’s jurisdiction, but Thurman is family on the sheriff’s wife’s side, so he agrees.

So begins “Return to Sender,” Craig Johnson’s 22nd installment in a series that inspired a TV show that ran for 6

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