"Who?"
"The person who took the necklace."
"Well, of course I know that," Eve spoke impatiently. "But who can it be? I feel sure it's one of the new servants or one of the hired waiters."
"In our business, madam, we usually suspect servants and waiters last." Then turning round very suddenly he demanded: "Who's that at the door?"
Eve, startled, moved towards the door, and in the same instant the detective put a small piece of paper into Mr. Prohack's lap, and Mr. Prohack read on the paper:
"Should like see you alone." The detective picked up the paper again. Mr. Prohack laughed joyously within himself.
"There's nobody at the door," said Eve. "How you frightened me!"
"Marian," said Mr. Prohack, fully inspired. "Take my keys off there, will you, and go to my study and unlock the top right-hand drawer of the big desk. You'll find a blue paper at the top at the back. Bring it to me. I don't know which is the right key, but you'll soon see."
And when Eve, eager with her important mission, had departed, Mr. Prohack continued to the detective:
"Pretty good that, eh, for an improvisation? The key of that drawer isn't on that ring at all. And even if she does manage to open the drawer there's no blue paper in there at all. She'll be quite some time."