There was the secret message!
"Proceed as planned."
Stuart became suddenly alert.
"By Jove!" he exclaimed. "I must drop down to the Inn, Mayo. I've been expecting some mail — "
"Get it tomorrow," suggested the millionaire.
"No," said Stuart, "I'll have to pick it up now. I can get it before midnight. I'll run down there and see you later."
"How about the car, Fleming?" questioned Mayo.
"Flat tire, sir," said Fleming. "I can fix it — "
"I'll walk down," interposed Stuart. "I'll see you later, Mayo. Don't wait up if I'm a bit late for you."
"I'd go along with you," said Mayo, "but I am a trifle tired. I don't know why — we only came two hundred and forty miles, from New York."