Oh, so destroying the will is the only ending? Ok, that makes a bit more sense; I assumed destroying the will was a bad ending, and that there was a better ending somewhere...I guess that's not the case.
Now I can sort of understand what you were trying to do, but I think it doesn't really work-- perhaps because the player isn't given a reason to destroy the will. I didn't see a reason to do it while I was playing-- I only did because I saw the option, and I wondered what would happen if I did it. Maybe you could make it so, after 2 or so rooms are explored, the Countess realizes how little chance there is of her husband finding the will. Then, after a few more rooms, she says more about that, and so on until the player catches on that their quest to deposit the will is hopeless, and realizes it should be destroyed.
Well, that's what I might do. Just an idea.