A faint, hopeful smile was on Mona's face now.
"What isn't never was to those that never knew," said Kitty briskly, and pushed a chair up to the table.

"Now sit down and write, please." Mona sat down.

Taking up a sheet of notepaper she looked at it dubiously.
"Oh, what a fool I am!" said Kitty, understanding the look.

"And that's what every criminal does--he forgets something.

I forgot the notepaper.
Of course you can't use that notepaper.