“A man’s got a right to do as he pleases!”

“Not always,” Penny corrected. “Saboteurs are at work along this waterfront, and it’s your duty to tell police what you know.”

“I didn’t see the men, I tell you! They came at me from behind.”

“Even so, you may be able to contribute information to the police. In any case, you’ll have to stay here until relieved—”

“Penny!” interrupted Louise from below. “There’s a boat coming!”

The steady chug of a motor could be heard, but for a moment the swirling mists hid the approaching vessel. Then a pleasure yacht, with pennants flying, came into view.

“It’s the Eloise III!” Penny cried, recognizing the craft as one belonging to Commodore Phillips of the Riverview Marine Club.

Waving their arms and shouting, the girls tried to attract the pilot’s attention. To their relief, the yacht veered slightly from her course, and the engines slackened speed.

“Yacht ahoy!” called Penny, cupping hands to her lips.

“Ahoy!” came the answering shout from Commodore Phillips. “What’s wrong there? Barge adrift?”