!!!SPOILERS for Blackwell series
The Cult is the big one, I'm sure it will get resolved.
Yes, this one for sure...
By Laureen, do you mean Lauren - Rosangela's Aunt? Not sure how that is a loose end, it's pretty much explained that the calling just gets so strong if ignored that it drives you insane, isn't it?
We still don't know why this happens. Joe certainly didn't want to harm her. Ghosts usually don't haunt mediums - they need to be actively looked for to be helped. Of four mediums we met (Countess, Rosa, Rosa's aunt and Rosa's grandmother) only Rosa remains unbroken.
I forget, what's the loose end for Madaleine? I'm sure once she feels she is no longer needed, Rosangela will help her get to her final destination.
The way she acted at the end of deception... my wild guess would be she's going to be a villain in the last story. She's now free, out in the world and unlike other ghosts aware of everything.
Joe is not a loose end at all IMO, regardless of how interesting his death might have been. Or were there some hints that it was tied to the whole medium business?
Madaleine called him special last time we met her. What makes ghosts becoming a spiritual guide remains unknown (even to Joe himself). Guess the Cult will have some answers...