Relieved, Joe swam on. In a few minutes he caught sight of a dark shape ahead. It was the motorboat.
Silently, he swam toward it until he had reached the side. A voice whispered:
"Is that you, Joe?"
"Yes."
Frank had already gained the boat. He now leaned over the side and grasped Joe's hand, helping his brother on board. Dripping wet, they both crouched in the boat.
"Lucky they didn't see the Sleuth tied down here," whispered Frank. "I've been waiting here for you. I thought sure they had you."
"It was a close call. They mistook us for harbor thieves, eh?"
"Yes."
"Did you see Chet?"
"It wasn't Chet after all."