“The chambermaid and the valet, parbleu ! You did not suspect? Not with my parting hint about the French chalk?”

“You said cabinetmakers used it.”

“Certainly they do⁠—to make drawers slide easily. Somebody wanted that drawer to slide in and out without any noise. Who could that be? Obviously, only the chambermaid. The plan was so ingenious that it did not at once leap to the eye⁠—not even to the eye of Hercule Poirot.

“Listen, this was how it was done. The valet was in the empty room next door, waiting. The French maid leaves the room. Quick as a flash the chambermaid whips open the drawer, takes out the jewel-case, and, slipping back the bolt, passes it through the door. The valet opens it at his leisure with the duplicate key with which he has provided himself, extracts the necklace, and waits his time. Célestine leaves the room again, and⁠—pst!⁠—in a flash the case is passed back again and replaced in the drawer.