In anticipation of the visit to Duluth and the Glensheen mansion I read "Will to Murder," the book written by one of the reporters who covered the case at the time of the murder of Elisabeth Congdon, along with the head detective and the (then) D.A. who prosecuted the case. The book was riveting and I'm embarrassed that this entire story was unknown to me.
Interestingly, the route that I took to get to Duluth was through the far north of Wisconsin, which was done in an effort to see some Fall color. Looking at a map, though, I realized that the road would take me through Brule. Elisabeth Congdon had a weekend home in Brule and, in fact, had been there the weekend before her murder. Didn't know if the property is still in the family (the house in Duluth passed to the University of Minnesota at Elisabeth's death as a result of a clause in her father's will), but the Brule property was privately owned by Elisabeth so it would have passed to her heirs. While it may sold in the past 30 years, I thought I'd try to see it anyway for the sake of symmetry given that I was on my way to Glensheen.