Sara was waiting beside her boat when Penny and Louise came running along the muddy shore. Without apologizing for being so late, they excitedly related their conversation with Old Noah.
“Say, maybe that hidden motorboat is mine!” the girl exclaimed. “What did it look like?”
“We didn’t take time to search for it,” Penny replied. “We knew you would be waiting so we came straight here.”
“Let’s see if we can find it,” Sara said, starting up the engine.
“Noah’s animals don’t like motorboats,” Louise chuckled. “I suggest we do our searching afoot.”
“All right,” Sara agreed readily, switching the motor off again. “Lead and I’ll follow.”
Penny and Louise guided their companion to the mouth of Bug Run and thence along its slippery banks to a clump of overhanging willows.
“According to Old Noah’s description, this should be the place,” Penny declared, looking about. “No sign of a boat though.”
Sara took off shoes and stockings and waded through the shallow, muddy water. Whenever she came to a clump of bushes, she would pull the branches aside to peer behind them.
“Old Noah may have been spoofing us,” Penny began, but just then Sara gave a little cry.
“Here it is! I’ve found it!”
Penny and Louise slid down the bank to the water’s edge. Behind a dense thicket, a motorboat had been pulled out on the sand. The engine remained attached, covered by a piece of canvas.
“Is it your boat, Sara?” Penny asked eagerly.
“It certainly is!” She spoke with emphasis. “The hull has been repainted, but it takes more than that to fool me.”
“Any positive way to identify it?”
“By the engine number. Ours was 985-877 unless I’m mistaken. I have it written down at home.”
“What’s the number of this engine?”
“The same!” Sara cried triumphantly after she had removed the canvas covering and examined it. “This is my property all right, and I shall take it back with me.”
“Old Noah spoke of two strangers who came here last night by boat,” Penny said thoughtfully.
“The fellow who stopped at the dock probably picked up a pal later on,” Sara commented, trying to shove the boat into the water. “My, this old tub is heavy! Want to help?”
“Wait, Sara!” Penny exclaimed. “Let’s leave the boat here.”
“Leave it here! Now that would be an idea! This little piece of floating wood represents nine hundred and fifty dollars.”
“I don’t mean that you’re to lose the boat,” Penny hastened to explain. “But if we take it now, we never will catch the fellow who stole it.”
“That’s true.”
“If we leave the boat here we can keep watch of the place and catch those scamps when they come back.”
“They may not come back,” Sara said, without warming to the plan. “Besides, I’ve no time to do a Sherlock Holmes in the bushes. I have my dock to look after.”
“Louise and I could do most of the watching.”
“Well, I don’t know,” Sara said dubiously. “Something might go wrong. I never would get over it if I lost the boat.”
“You won’t lose the boat,” promised Penny. “It’s really important that we catch those two men, Sara. From what Old Noah said, they may be connected with the bridge dynamiting.”
“What makes you think that?”
“Because Old Noah found a cache of dynamite somewhere near here.”
“He won’t tell us its location,” added Louise.
“If it should develop that the men are saboteurs, we might learn something which would help your brother’s case,” Penny said persuasively. “How about it, Sara?”
“I’d be glad to risk the boat if I thought it would help Burt.”
“Then let’s leave it here. We can watch the spot night and day.”
“And what will your parents have to say?”
Penny’s face fell. “Well, I suppose when it comes right to it, Dad will set his foot down. But at least we can watch during the day time. Then if necessary, we might report to the police.”
“Let’s leave them out of it,” Sara said feelingly. “If you girls will remain throughout the day, I’ll stand the night watch.”
“Not alone!” Louise protested.
“Why not?” Sara asked, amused. “I’ve frequently camped out along the river at night. Once I made a canoe trip the full length of the river just for the fun of it.”
“Louise and I will stay here now while you return to the dock,” Penny declared. “Better call our parents when you get there and break the news as gently as possible.”
“What will you do for lunch?”
“Maybe we can beg a sandwich or a fried egg from Old Noah,” Penny chuckled. “We’ll manage somehow.”
“Well, whatever you do, don’t leave the boat unguarded,” Sara advised, starting away. “As soon as it gets dark I’ll come back.”
Left to themselves, Penny and Louise explored the locality thoroughly. Not far away they found a log which offered a comfortable seat, and they screened it with brush.
“Now we’re all ready for Mr. Saboteur,” Penny said. “He can’t come too soon to suit me.”
“And just what are we going to do when he does arrive?”
“I forgot to figure that angle,” Penny confessed. “We may have to call on Old Noah for help.”
“Noah will be busy doing a washing or giving the goat a beauty treatment,” Louise laughed.
The sun lifted higher, and steam rising from the damp earth made the girls increasingly uncomfortable. As the hours dragged by they rapidly lost zest for their adventure. Long before noon they were assailed by the pangs of hunger.
“If I could catch a bullfrog I’d be tempted to eat him raw,” Penny remarked sadly. “How about chasing up to the ark? Noah might give us a nibble of something.”
“Dare we go away and leave the boat?”
“Oh, it’s safe enough for a few minutes,” Penny returned. “The idea of staying here wasn’t such a good one anyhow. What if those men should never come back?”
“This is a fine time to be thinking of that possibility!”
Moving quietly through the woods, the girls came to the ark. They could hear the hens cackling, and as they called Old Noah’s name, the parrot answered, squawking: “Polly wants a cracker.”
“You’ve got nothing on me, Polly,” said Penny. “Where’s your master?”
The old ark keeper was nowhere in evidence. Nor were the girls able to board the boat, for the gangplank had been removed.
“Now if this isn’t a situation!” Penny exclaimed, exasperated. “It looks as if we’re going to starve to death.”
After lingering about the ark for a few minutes, they returned to their former hiding place. By this time they were so sorry for themselves that they could think of nothing but their discomfort. Belatedly, they recalled that Sara had smiled as she went away.
“She knew what we were up against staying here!” Penny declared. “Figured us for a couple of softies, I bet!”
“While everyone knows we’re regular Commandos,” Louise retorted sarcastically. “Why, if necessary we could go an entire day without eating.”
“That’s exactly what we will do,” announced Penny with renewed determination. “I’ll stay here until Sara comes if it kills me. But I hope you slug me if ever I get another idea like this.”
“Don’t worry, I will,” promised Louise. “In fact, I may not wait that long!”
The hours dragged slowly on. All amusements failing them, the girls took turns sleeping. Twice they went to the ark, but Old Noah had not returned.
At last, as shadows lengthened, Louise and Penny were confronted with a new worry. It occurred to them that Sara might not expect to take over her duties until long after dark. The air had grown chilly, and hungry mosquitoes were swarming from their breeding places.
“Even my Mother doesn’t seem concerned about me any more,” Louise moaned, slapping at a foraging insect.
Penny glared at the motorboat snugly hidden in the underbrush. “If that thing weren’t worth so much money, I’d certainly chuck this job. Even so, I’m just about desperate.”
Louise, huddled against a tree trunk, suddenly straightened alertly. Placing a warning finger on her lips, she listened.
“Someone’s coming, Penny!”
“Maybe it’s Sara with a basket of food. I’d rather see her than a dozen saboteurs!”
“Keep quiet, you egg,” Louise warned nervously.
Crouching low behind their shelter, the girls waited. They could hear a steady tramp, tramp of feet coming up the stream on their side of the bank.
“That’s not Sara,” murmured Penny. “She doesn’t walk like an elephant. What’ll we do if it should be a saboteur?”
“I’m scared,” Louise chattered, hugging her chum’s arm.
The footsteps came closer. Peering out through the screen of underbrush, the girls saw a young man coming straight toward their hiding place. In his hand he carried a safety-cap gasoline can.
“Who is he?” whispered Louise.
“Can’t tell yet,” Penny responded, straining her eyes to see. “He looks a little like—oh, my aunt! That’s who it is—Bill Evans! Now what’s he doing here?”