So you have no clue who murdered them at all?

[her grip on her cane doesn't exactly relax, but she shrugs.]

And it's not that easy. A pen wouldn't make the right kind of sound waves - they have to be big, so it can be as loud as it needs to be.

[to prove her point, she feels for a spare paintbrush for her free hand, and brings it down on the table. a sharp sound, but definitely nothing close to what had happened before.]