“Now that we have settled this affair, doctor, I want you to look at a lock in my cabinet that interests me greatly. Gamain brought it today. Its mechanism is curious and complex. It will interest a scientific man like yourself, I am sure.”

“I shall be glad to attend Your Majesty.”

“Give me leave, Sire,” again said the Duc de Rivau-Huet. “Your Majesty,” continued the old man, standing very erect, “the Marquis du Trémigon averred that he was in my granddaughter’s apartments until a late hour the other night.”

“It is false,” said the Queen.

“Madame, I know that. What I wish to know is, who was there?”

“Monsieur! Before them all!” exclaimed Mademoiselle, startled beyond measure by this surprising development. This unlucky speech in itself was a confession.

“The King is the fountain of nobility in the land,” continued the Duke, striving to regain his composure. “You are a maid of honor to the Queen, Mademoiselle. That gentleman”—he pointed to me—“heard the accusation and denied it. These are his friends. Here is some mystery. I wish an explanation.”

“But, Duke—” began the King, with a puzzled look.

“I crave Your Majesty’s pardon. Even royalty may give place to the feelings of a grandsire. Will you allow me to conduct this affair in my own way?”

“Go on,” said the King.