The Cascades provide the endless backdrop for this Oregon serial killer. Back and forth on US Highway 20, the Watcher spends decades looking for trouble. He finds it over and over again until the search for a young girl brings it to a halt.
Sources:
https://projects.oregonlive.com/ghostsofhighway20/melissasheila/
https://projects.oregonlive.com/ghostsofhighway20/ackroyd/
https://www.smith.edu/news/noelle-crombie-92-highway-20
Audible