Last night when I got home from work I noticed that a door in the basement was closed. I thought it was a little bit weird, so I opened it and didn't think any more about it. Later,
Kal called me to the basement and asked me how
this happened.

He was furious. He was sure it was the boys and I was sure it wasn't. They are sneaky and can be destructive BUT they could never keep
this a secret! (FYI - this is the wall between the guest/craft room and the back room in the basement). So he called the boys downstairs. They were shocked. They thought someone broke into our house and did this. Simon was convinced that someone came in with a chisel and "chisel, chisel,
chiselled" it.
the view from the other side
I, however, had a different idea. I started looking at all of the clues (remember I like British t.v. - especially the mysteries). I found hair. Black hair. Stuck in the vent and on the drywall on the opposite side. There were little holes in the drywall on the finished side that appeared to be from something pulling itself through the hole. I gathered my evidence and went to talk to my husband. "It was the dog," I said. "No, not the dog," he said. I showed him the evidence and explained my theory. He said,"Let's look at her feet".
drywall dust!
Here is our culprit. I think she got herself locked in the backroom and found a way out - of her own means. Now we have one more "thing" to add to the to-do list.