Don't really know what the scam is.  Had a middle aged woman come to the door who asked if my ex was here.  Let her in (bad mistake) out of good manners but she started to act strangely.  Asked if she called his cell would she here it ring?? Huh? Weird.   She left a note with her name/telephone number 403-809-5480 to have him call.  Said something along the lines of "he will be happy I was here" and "everything will be all right now".  She seemed shady.  I saw her banging on my door while I was walking the dog at 10:20 pm again that night. Did not approach her.  Later told ex but he doesn't know her.