of him," returned Tom Shocker. "Now, let me see. I have it—we'll catch him on the bridge. His carriage is bound to come that way, to get off Goat Island."
Dave and his friends spent the best part of a quarter of an hour around the Three Sisters Islands and then returned to their carriage.
"Now we can go to the hotel and have dinner," said Dunston Porter. "And then we can take a local train back to Buffalo."
The carriage was just crossing the bridge that connects Goat Island with the city of Niagara Falls when a man stepped up and stopped the turnout. It was Tom Shocker.
"Excuse me, but I reckon this is the number, 176," he said. "Is there a young man here named David Porter?"
"Yes, I am Dave Porter," answered Dave, and looked at Shocker curiously. The fellow was a total stranger to him.
"Got a note for you," went on Shocker, and produced it. It was sealed and marked Private in plain letters.
Wondering what the note could contain, Dave opened and read it. His face changed color and he gave a little gasp.
"Excuse me, I'll have to—to leave you for a little while," he stammered to the others.
"What's the matter?" asked Roger.
