I'll let you in a little secret: it's going to be quite a long time before you actually come across the puzzle this goes to. Fooey.
You'll know it when you see it; it looks just like the drawing in the corner of the second page of the puzzle -- that odd thing with two rectangles and two circular arrows.
In the meantime, you might as well go to the cemetery and look for Ethel's grave. And what do you know --
-- there are no graves that say "Ethel" on them. There is one with the first name marked out, however.
The important thing here is to note the date: for amateurs it's January 1, 1933, and for masters it's March 14, 1933.
You'll need that date to open a box in one of the hidden areas --
-- the one that's in the cellar behind the rack of bottles.
Behind the Bottles
How do I open the box under the dirt?