Originally Posted by miss marple
It is looking for a needle in a haystack. My approach is looking to see what is plausible in her story [ so far most of it is] and just hoping some connections may start to make sense. MK may not have been her real name but if her story is more or less true give or take a few porkies, a pattern may immerge.
You didn't mention if this Mary Davies had a son, or a male relative?, of approximately the same age as Mary Kelly.