What's my goal here?

Hint 1 of 6:

The whole idea here is to find a way into Ketch's house.

Hint 2 of 6:

But it seems that the museum is closed for renovations.

Hint 3 of 6:

If you talk around some, you should learn that the guy who's surveying the
area has nothing but bad intentions.

Hint 4 of 6:

The Ketch sisters need some convincing on this.

Hint 5 of 6:

So, in short, your main goal here is to get your hands on Bronson's plans and
show them to the old ladies.