“Unfortunately, I have no proof beyond my surmise, unless⁠—” With sudden energy, he caught me by the arm, and whirled me down the hall, calling out in French in his excitement: “Mademoiselle Dorcas, Mademoiselle Dorcas, un moment, s’il vous plaît !”

Dorcas, quite flurried by the noise, came hurrying out of the pantry.

“My good Dorcas, I have an idea⁠—a little idea⁠—if it should prove justified, what magnificent chance! Tell me, on Monday, not Tuesday, Dorcas, but Monday, the day before the tragedy, did anything go wrong with Mrs. Inglethorp’s bell?”

Dorcas looked very surprised.

“Yes, sir, now you mention it, it did; though I don’t know how you came to hear of it. A mouse, or some such, must have nibbled the wire through. The man came and put it right on Tuesday morning.”