and Biff were a considerable distance in the lead.
"We'll have to step on it," said Joe.
"We'll catch them, all right. There isn't a boat on the bay can beat the Sleuth."
The engine roared and the boat seemed fairly to leap out of the water as it plunged forward. Spray dashed over the bows as the fleet launch headed out in pursuit of the others.
Frank glanced at the sky.
Biff and Chet had certainly chosen a bad day for their departure. The sky had been none too promising at dawn, but now it was clouding over with every promise of a downpour, and there was a heavy cloud on the horizon. Then, too, there was a suspicious absence of wind, and the bay was in a flat calm.
"I wish they'd picked some other day," he remarked quietly to Joe. "It looks like squally weather out at sea."
"I don't like the looks of the sky myself. However, they're away, so there's no use saying anything. It might alarm Iola."
The Sleuth was rapidly overhauling the other boats, although Tony and Biff were engaging in a spirited race down the bay. The girls enjoyed the swift progress and were laughing with excitement as they saw the distance narrowing between Frank and the others.
Suddenly a low rumble of thunder caused
