Sherlock Cat and The Missing Mousie

"From now on, I am going to be Sherlock Holmes, the World''s Greatest Cat Detective."
With those words, my friend Spot decided he would become a crime-solving kitty.
"And you, of course," he said dramatically. "Will be my faithful friend, Dr. John Watson. The one who writes down all of my adventures and shares them with the world! We''ll be famous! Everyone will know the name ''Sherlock Holmes, The World''s Greatest Cat Detective!''"
"Mm hmm," I agreed. I wasn''t too worried. I was sure that, by morning, Spot would have forgotten all about becoming Sherlock Holmes.
Boy, oh boy, was I wrong.