Well, it looks like catching that stray cat last night came to naught. It jumped up on the shelving, and found its way into the ceiling of the basement, as I noted last night, and it appears that there is a passage between that and the outside.
When I came home, I saw it running away from the (still somewhat full) cat dish of food.
It’s a bit of a relief actually, because I was concerned that I would have to cut a hole in the ceiling to rescue it.
We do want to get another cat, but I think that we will go the Humane Society route.
Now I have to get all the ceiling panels back into place.
This is chapter 2 of the tale of RP the Cat.