The Swiftcurrent Cafe: Bud Shumway Mystery Series, Book 13 (Unabridged‪)‬

When Sheriff Bud Shumway’s aunt and uncle invite him and his wife to join them for a vacation in beautiful Glacier National Park, he has no idea that he'll soon be on a search for their daughter, the same cousin Bud went to high school with and who everyone called the Jewel of the Desert. But Bud's not sure what he can do to help, especially given the strange circumstances surrounding her disappearance and the fact that she vanished some 25 years ago. 

Being Bud, he doesn’t let that stop him, and when his uncle also goes missing, Bud soon finds himself trekking through some of the wildest and most remote mountains in the Lower 48, a landscape filled with grizzly bears, sudden blizzards, thru-hikers, wiener dogs, aquatic entomologists, mysterious Red Bus jammers, and Flat-Earthers, far from Bud’s comfort zone in his quiet little desert town of Green River, Utah, all while trying to unravel the mystery of the Ghost of the Weeping Wall, as well as meeting up with a few ghosts of his own. 

This is book 13 in the Bud Shumway Mystery Series.