"Shortly after one o'clock. He was stopped at the front door by a servant who handed him a note. Mr. Atherwald read it and walked down toward the garden."

"I wonder which one of the servants spoke to him? It was at the front door, you say?"

"Yes."

"Then it must have been Gregg. I'll talk with him."

Forgetting Penny, Mrs. Kippenberg hastened down the stairway. She jangled a bell and asked that the manservant be sent to her. Unnoticed, Penny lingered to hear the interview.

The man came into the room. "You sent for me, Mrs. Kippenberg?" he inquired.

"Yes, Gregg. You were at the door when Mr. Atherwald arrived?"

"I was, Madam."

"I understand you handed him a note which he read."

"Yes, Madam."

"Who gave you the note?"

"Mrs. Latch, the cook. She told me it was brought to the kitchen door early this morning by a most disreputable looking boy."

"He had been hired to deliver it for another person, I suppose?"

"Yes, Madam. The boy told Mrs. Latch that the message came from a friend of Mr. Atherwald's and should be given to him as soon as he arrived."

"You have no idea what the note contained?"

"No, Mrs. Kippenberg, the envelope was sealed."

Sensing that when the interview ended Mrs. Kippenberg's wrath might again descend upon her, Penny decided not to tempt fate. While the woman was still talking with the servant, she slipped out of the house.

"Atherwald might have had that note sent to himself, but I doubt it," she told herself. "Either he is still on the estate, or the boatman would have had to take him back across the river."

She walked quickly down to the dock and was elated to find the guest launch tied up there. The boatman answered her questions readily. He had not seen Grant Atherwald since early in the afternoon. Salt was the only person he had taken back across the river.

"Have you noticed any other boat leaving the estate?" inquired Penny.

"Boats have been going up and down the river all day," the man answered with a shrug. "I didn't notice any particular one."

Penny glanced across the water. She could see Salt perched on the drawbridge waiting for her. But she was not yet ready to leave the estate.

Ignoring his shout to "come on," she turned and walked back toward the house. Deliberately, she chose the same path which she and Salt had followed earlier in the afternoon.

A swift walk brought her to the forbidden trail with the barrier sign.

Penny glanced around to be certain she was not under observation. Then she stepped boldly over the wire.

Pa.s.sing the place where she and Salt had talked with the gardener, she noticed his trowel lying on the ground. There was no evidence that he had done any work.

However, all along the path flowering shrubs were well trimmed and tended.

"So this part of the estate isn't fixed up," Penny mused. "It's much nicer than the other section in my opinion. I wonder why that gardener told so many lies?"

The path led deeper into the woods. Rustic benches invited one to linger, but Penny walked rapidly onward.

Unexpectedly, she came to a little clearing, and saw before her a large, circular pool. From a gap in the trees, warm sunshine poured down upon the bed of flowers which flanked the cement sides, making a circle of brilliant color.

"So this is where the path leads," thought Penny. "No mystery here after all."

She was at a loss to understand why this portion of the estate had been closed to visitors for certainly it was the most beautiful part. Yet there was a quality to the beauty which the girl did not like.

As she stood staring at the pool, she was fully aware of an uneasy feeling which had taken possession of her. It was almost as if she stood in the presence of something sinister and unknown. The gentle rustling of the tree leaves, the cool river air blowing against her cheek, only served to heighten the feeling.

She drew closer and peered down into the blue depths of the pool. She could not see the bottom plainly for the water was choked with a tangle of feathery plants. A few yellow lilies floated on the surface.

Penny absently reached out to pluck one. But as the stem snapped off, she gave a little scream and dropped the flower. She had seen a large, shadowy form slithering through the water beneath her.

Penny backed a step away from the pool. From among the lily pads an ugly head emerged and a broad snout was raised above the surface for an instant. Powerful jaws opened and closed, revealing jagged teeth set in deep pits.

"An alligator!" Penny exclaimed aloud. "Such a horrid, ugly creature! And to think, I nearly put my hand in that water."

She shivered and watched the movements of the alligator. Its head scooted smoothly over the water for a short distance. Then with a swish of its tail, the reptile submerged and the pool was as placid as before.

"Eight feet long if it's an inch," estimated Penny. "Why would any person in his right mind keep such a creature here? Why, it's dangerous."

She felt enraged, thinking how close she had come to touching the alligator. Yet justice compelled her to admit that she had only herself to blame. Deliberately, she had disregarded the warning not to explore the forbidden trail.

"The Kippenbergs keep nice pets," she thought ironically. "If anyone fell into that pool it would be just too bad."

Now that her curiosity was satisfied, Penny had not the slightest desire to linger near the lily pool. With another glance down into the murky depths she turned away, but she had taken less than a dozen steps when she paused. Her attention was held by a bright and shiny object which lay in the dust at her feet.

With a low cry of surprise she reached down and picked up a plain band of white gold. Obviously, it was a wedding ring.

"Now where did this come from?" Penny turned it over on the palm of her hand.

Startled thoughts leaped into her mind. She felt certain Grant Atherwald had taken this same path earlier in the afternoon. It was logical to believe that the ring had been his, intended for Sylvia Kippenberg. Had he lost the band accidentally or deliberately thrown it away?

Slowly, Penny's gaze roved to the lily pond. She noted that the coping was so low that one who walked carelessly might easily stumble and fall into the water. It made her shudder to think of such a gruesome possibility, yet she could not avoid giving it consideration. For that matter, Grant Atherwald might have been lured to this isolated spot. The mysterious message--

Penny delved no deeper into the problem for suddenly she felt someone grasp her arms. With a terrified cry she whirled about to face her a.s.sailant.

CHAPTER 7 _THE FORBIDDEN POOL_