Black Cat

I was sitting in my chair in the living room working on my NYT crossword -- when quietly down the hall walks a black cat (probably from my bedroom)! We own a white cat which lives upstairs and we own a gray cat. We do not own a black cat. I called dd and she put the gray cat in her bedroom, white cat is already in ds's bedroom and dd comes to help.

We open the door and black cat runs away.