Joan disappeared in 1962. It’s kind of unusual because Ann Rule normally doesn’t write about unsolved cases, though she’s made exceptions to that rule in the past, writing about Julie Weflen for example. At least in Joan’s case there is a suspect — her husband, Robert, unfortunately deceased. With Julie Weflen, nobody seems to know anything.
I will have to read the book when it comes out. I’ve read almost all her books and I met her at a book sighting in early 2002, when I was sixteen. She complimented my hair.