"But he came here. The wedding ring was found near the pool. Surely you must have heard some sound for I know you were in this part of the garden."

"Well, I didn't," the man said sullenly. "The only persons I saw were a newspaper photographer and a girl."

"Please don't take offense," Miss Kippenberg murmured, getting up from the bench. "I've been terribly upset these past few days."

She walked slowly to the edge of the pool. There she stopped short, staring down at an object which lay on the flagstones at her feet. It was the stick which Penny had dropped only a moment before.

"What have you found?" the gardener cried.

He went quickly to her side and took the damp stick from her hand.

"Someone has been here prying around," he said in a harsh voice. "This was used to investigate the water in the pool."

"And whoever it was must be close by even now. Otherwise the stick would have dried out in the sun."

"You go back to the house," the man commanded. "I'll look around."

In their hideout amid the bushes, Penny and Louise gazed at each other with chagrin. No word was spoken for even a whisper might have been heard. With a common desire for escape, they glided with cat-like tread toward the river.

CHAPTER 16 _GATHERING CLUES_

The girls could hear no movement behind them as they darted down the path. They dared to hope that they had eluded the old gardener.

Then as they came within sight of the river, Louise stumbled over a vine.

Although she stifled an outcry the dull thud of her body against the ground seemed actually to reverberate through the forest. A black crow on the lower limb of an oak tree cawed in protest before he flew away.

Penny pulled Louise to her feet and they went on as fast as they could, but they knew the sound had betrayed them. Now they could hear the man in pursuit, his heavy shoes pounding on the hard, dry path.

"Run!" Penny commanded.

They reached the river bank and looked about for the boat which would take them across. As they had feared it was on the opposite sh.o.r.e.

Penny gestured frantically, but the boy did not understand the need for haste. He picked up his oars and rowed toward them at a very deliberate pace.

"Oh, he'll never get here in time," Louise murmured fearfully. "Shall we hide?"

"That's all we can do."

They realized then that they had waited too long. Before they could dodge into the deeper thicket the gardener reached the clearing.

"So it's you again!" he cried wrathfully, glaring at Penny.

"Please, we didn't mean any harm. We can explain--"

"This stick is explanation enough for me!" the man shouted, waving it above his head. "You were trying to find out about the lily pool!"

"We were only trying to get a pin which I dropped into the water," Louise said, backing a step away.

"I don't believe you!" the man snapped. "You can't fool me! I know why you came here, and you'll pay for your folly! You'll never take the secret away with you!"

With a swift, animal-like spring which belied his age, the gardener hurled himself toward the girls. He seized Penny's arm giving it a cruel twist.

"You're coming along with me," he announced harshly.

"Let me go!" Penny cried, trying to free herself.

"You're going with me to the house. You've been altogether too prying.

Now you'll take your punishment, both of you."

The gardener might have managed Penny alone, but he was no match for two athletic girls. As he tried to seize Louise, Penny twisted free.

Quick as a flash, she grasped the man's felt hat, jamming it down on his head over his eyes. While he was trying to pull it off, Louise also wriggled from his grasp.

The two girls ran to the water's edge. Their boat had drawn close to sh.o.r.e. Without waiting for it to beach they waded out over their shoetops and climbed aboard.

"Don't either of you ever come here again!" the gardener hurled after them. "If you do--"

The rest of the threat was carried away by the wind. However, Penny could not resist waving her hand and calling back: "Bye, bye, old timer! We'll be seeing you!"

"What's the matter with that man anyhow?" asked the boy who rowed the boat. "Didn't he want you on the estate?"

"On the contrary, he invited us to remain and we declined," grinned Penny. "Just temperament, that's all. He can't make up his mind which way he would like to have it."

Allowing the boy to puzzle over the remark, she busied herself pouring water from her sodden shoes. The visit to the estate had not turned out at all as she had planned. She had failed to talk with Miss Kippenberg, and it was almost certain that from now on servants would keep a much closer watch for intruders.

The only vital information she had gleaned resulted from overhearing the conversation between Sylvia Kippenberg and the gardener.

"She talked with him as if they were well acquainted," mused Penny. "Miss Kippenberg must have thought he knew more about Grant Atherwald's disappearance than he would tell. And she seems to be afraid the Law will ask too many questions. Otherwise, she wouldn't have suggested getting rid of the alligator."

One additional observation Penny had made, but she decided not to speak of it until she and Louise were alone.

The boat reached sh.o.r.e and the two girls stepped out on the muddy bank.

"Will you need me again?" inquired the boy.

"I may," said Penny, "and I can't tell you exactly when. Where do you keep your boat?"

"Up the river just beyond that crooked maple tree. I hide it in the bushes and I keep the oars inside a hollow log close by. You won't have any trouble finding it."

Penny and Louise said goodbye to the lad and scrambled up the bank.

"I'm sure I'll not be going back to _that_ place," the latter declared emphatically. "I just wonder what would have happened if we hadn't broken away."

"We might have been locked up in the stone tower," Penny laughed. "Then another one of my theories would have proven itself."