“So I believe. Well, there’s the note, at any rate. Better read it and find out what he has to say.”

Frank tore open the envelope and removed a folded slip of paper. There were a few type-written words. He and Joe read them with growing amazement.

“Well, what do you know about that?” exclaimed Frank finally.

“I wonder what’s the idea?” said his brother.

Frank handed the note over to their father.

“What do you make of it, Dad?”

Fenton Hardy read the note. He looked puzzled. Then he handed it back to the boys.

“I can’t say, I’m sure,” he said. “It’s a strange note. Still, I suppose you had better do as he asks, and then you’ll know more about it later.”

“We certainly will!” said Frank.

Then he read the note over again.