V.good. Tricky, but it all made sense eventually. I ran out of time twice so started again, and nearly didn't manage it the third time Mrs McGinty seemed like the big clue for the first group I solved. For the final (for me) group, which I didn't solve, I spotted the link because of Edwin Drood, and that jogged my memory about another item in that group, so I had a guess.

Moves cleverly from the seemingly easy to the genuinely fiendish