You'll be led to this puzzle by something you heard in the journal on Jess's phone.
As usual, Nancy's quick instructions aren't as helpful as they might be. Your goal is to rearrange the pieces of glass in this stained glass window so that each color touches another piece the same color. Read to the end of this hint for a screenshot showing the correct solution.
The pieces with the curly metal decorations can't be moved, but all the others can. Click on a piece to pick it up.
As you move a piece toward a slot where it can go, it will rotate to fit into that slot. So any little triangular piece can fit into any little triangular slot.
You're also trying to get the letters the right way up, which is a little confusing since the font is similar to the one called Uncial and is thus kind of hard to read. The one that looks like a small n is actually a capital U, for example.
The best way to start here is to place the large side pieces so they fit against the fixed pieces.
And here's a little game: The small piece with the B on it goes at the upper left, in the only slot that will put it right-side up.
Still flummoxed? Okay, here come the answer:
You may not be able to read the result, but Nancy will say it for you: it's Beauregard.