You'll get this note after you follow Harper's instructions and find her in the cellar. It's called "Ghost Note" in your inventory.
This time, most of the note is unimportant. You only need to pay attention to --
-- the last line of the poem, the drawing, and the obvious logic puzzle underneath.
The line is, "Push glass vessels, and find me in below." Glass vessels -- well, where have you seen something like the drawing?
How about the wine rack in the cellar? It's on the right when you enter, to the right of the rack of barrels.
Now we need to figure out what we're supposed to do with these wine bottles. Read to the end of this hint for step-by-step directions.
The drawing shows the wine bottles in the rack with letters assigned to each one. The text to the left of the drawing is telling you which bottles to push and in which order.
These kinds of puzzles are all about relations -- how one letter lies in relation to another. Figure out one relationship, and often another will fall into place.
It helps if you write the letters on sticky notes and then move them around to see which one goes where.
Both the amateur and master puzzles tell you which letter is third, so you can put that one in place for sure.
Once you know the order, letter the bottles in your mind A through O, as they're shown on the note. (Notice the empty slots and don't give them letters or you'll get off.) Then just click on the bottles in the order you figured out.
When you do it right, there's a loud clunk and a new secret tunnel opens up. Well, what are you waiting for? Get in there!
In case it's not obvious, you're in a little crawl space under the front porch, and Colton is walking on the porch having a phone conversation he thinks is private. Let's listen, shall we?