"You what?"

"Erm, yes, Mrs. Hudson, we want to keep a cat. Sherlock brought home an orphaned kitten today."

Their landlady sighed. "Well, that's a new one. Are you sure a cat will survive him?"

"Not at all," John said, "but I'll try and keep it – her – away from the experiments."

"It's a she, then?"

"Yes, we've named her Debbie. A little tabby."

Mrs. Hudson shook her head. "All right then, but you look after her, got it? No coming to me when Sherlock's dragging you out on some case and you can't leave her alone."

"Got it," John said. The battle was won.

The name Debbie is a tribute to the James Herriot story, The Christmas Kitten.