Here are some links to active sleuth communities working on unsolved cases that may be connected to the Forest City Killer.
I know that pages full of links are usually pretty useless, but the search function on Unsolved Canada doesn't work very well, so I thought in this case it might actually be helpful. I've included links to the cases below for further reading and conversation. If you start a Reddit or other conversation thread about any of these cases, send me the link and I'll post it here.
Here are some other cases you might want to research that are not included in the book, and deserve further investigation. I'm happy to add to this list if you want to email me!