"The Napoli!"
He spun the wheel about so that the Sleuth would cut across the bows of the approaching craft. Steadily, through the darkness, came the throbbing of the engine, and as the boat came closer the Hardy boys became more and more convinced that it was Tony Prito's craft.
"I've been wondering what became of him," Frank declared. "When he didn't show up earlier I began to think he must have had to call off the trip."
"It may not be him after all, but I'm sure it's his boat. If it isn't I'll never believe my ears again."
The two boats approached one another. Frank shut down the engine of the Sleuth, rose from his seat, and shouted:
"Napoli, ahoy!"
Almost immediately the roar of the other engine died to a murmur and a well-known voice replied:
"This is the Napoli. Who are you?"
It was the voice of Tony Prito. Joe gave a yell of delight.
"It's us!" shouted Frank. "The Hardy boys!"
They could hear sounds of excited talking in the other boat, and a suppressed cheer.
"Coming over!" Tony called out, and in a few minutes the two boats had drawn up along-
