"Excuse me, there was no one in Number Five during that fifteen minutes, and the party who had engaged Number Seven did not come."
"Ah! Then if any stranger went into Number Six during that fifteen minutes he must have come from the banquet room?"
"Yes, sir."
"By this door, B?"
"That's the only way he could have come without my seeing him."
"And if he went out from Number Six afterwards, I mean if he left the hotel, he must have passed you in the corridor?"
"Exactly." Joseph's face was brightening.
"Now, did anyone pass you in the corridor, anyone except the lady?"
"Yes, sir," answered the waiter eagerly, "a young man passed me."
"Going out?"