Scaled Down Scales
Last Will and Testament
One of the few Dungeon Delves I would recommend. A lot of the rest seem to me to be module ideas that bombed, whose authors were compensated by letting them be published as delves.
The three encounters in this delve:
I used all three as an introductory encounter to get the party together. And Dungeon Delve 11 (from the book) worked so well for this I would recommend downscaling it as an introduction to any appropriate campaign.