I love the islands in northern Lake Michigan, especially the line that goes from Washington Island in WI to Rock Island north to St. Martin and then to Summer I

I love the islands in northern Lake Michigan, especially the line that goes from Washington Island in WI to Rock Island north to St. Martin and then to Summer Island. It's always seemed so remote. I assume these are the "Huron Islands"? I've never seen them referred to as such and when I search for them I get links to islands in Lake Superior, which are also interesting but not the same. I'm interested in the book now. Even if it turns out not to be the Griffon, it's an interesting story.