"You must admit," she said, "that all this is incomprehensible.

"Yes, of course ... but, all the same ... perhaps not."

"Have you any idea?"

He waited a few seconds before replying:

"What puzzles me is this telescope hidden, dropped in that corner, at the last moment. I wonder what it was used for.... From the ground-floor windows you see nothing but the trees in the garden ... and the same, I expect, from all the windows.... We are in a valley, without the least open horizon.... To use the telescope, one would have to go up to the top of the house.... Shall we go up?"

She did not hesitate. The mystery surrounding the whole adventure excited her curiosity so keenly that she could think of nothing but accompanying Renine and a.s.sisting him in his investigations.

They went upstairs accordingly, and, on the second floor, came to a landing where they found the spiral staircase leading to the belvedere.

At the top of this was a platform in the open air, but surrounded by a parapet over six feet high.

"There must have been battlements which have been filled in since,"

observed Prince Renine. "Look here, there were loop-holes at one time. They may have been blocked."

"In any case," she said, "the telescope was of no use up here either and we may as well go down again."

"I don't agree," he said. "Logic tells us that there must have been some gap through which the country could be seen and this was the spot where the telescope was used."

He hoisted himself by his wrists to the top of the parapet and then saw that this point of vantage commanded the whole of the valley, including the park, with its tall trees marking the horizon; and, beyond, a depression in a wood surmounting a hill, at a distance of some seven or eight hundred yards, stood another tower, squat and in ruins, covered with ivy from top to bottom.

Renine resumed his inspection. He seemed to consider that the key to the problem lay in the use to which the telescope was put and that the problem would be solved if only they could discover this use.

He studied the loop-holes one after the other. One of them, or rather the place which it had occupied, attracted his attention above the rest. In the middle of the layer of plaster, which had served to block it, there was a hollow filled with earth in which plants had grown. He pulled out the plants and removed the earth, thus clearing the mouth of a hole some five inches in diameter, which completely penetrated the wall. On bending forward, Renine perceived that this deep and narrow opening inevitably carried the eye, above the dense tops of the trees and through the depression in the hill, to the ivy-clad tower.

At the bottom of this channel, in a sort of groove which ran through it like a gutter, the telescope fitted so exactly that it was quite impossible to shift it, however little, either to the right or to the left.

Renine, after wiping the outside of the lenses, while taking care not to disturb the lie of the instrument by a hair's breadth, put his eye to the small end.

He remained for thirty or forty seconds, gazing attentively and silently.

Then he drew himself up and said, in a husky voice:

"It's terrible ... it's really terrible."

"What is?" she asked, anxiously.

"Look."

She bent down but the image was not clear to her and the telescope had to be focussed to suit her sight. The next moment she shuddered and said:

"It's two scarecrows, isn't it, both stuck up on the top? But why?"

"Look again," he said. "Look more carefully under the hats ... the faces...."

"Oh!" she cried, turning faint with horror, "how awful!"

The field of the telescope, like the circular picture shown by a magic lantern, presented this spectacle: the platform of a broken tower, the walls of which were higher in the more distant part and formed as it were a back-drop, over which surged waves of ivy. In front, amid a cl.u.s.ter of bushes, were two human beings, a man and a woman, leaning back against a heap of fallen stones.

But the words man and woman could hardly be applied to these two forms, these two sinister puppets, which, it is true, wore clothes and hats--or rather shreds of clothes and remnants of hats--but had lost their eyes, their cheeks, their chins, every particle of flesh, until they were actually and positively nothing more than two skeletons.

"Two skeletons," stammered Hortense. "Two skeletons with clothes on. Who carried them up there?"

"n.o.body."

"But still...."

"That man and that woman must have died at the top of the tower, years and years ago ... and their flesh rotted under their clothes and the ravens ate them."

"But it's hideous, hideous!" cried Hortense, pale as death, her face drawn with horror.

Half an hour later, Hortense Daniel and Renine left the Chateau de Halingre. Before their departure, they had gone as far as the ivy-grown tower, the remains of an old donjon-keep more than half demolished. The inside was empty. There seemed to have been a way of climbing to the top, at a comparatively recent period, by means of wooden stairs and ladders which now lay broken and scattered over the ground. The tower backed against the wall which marked the end of the park.

A curious fact, which surprised Hortense, was that Prince Renine had neglected to pursue a more minute enquiry, as though the matter had lost all interest for him. He did not even speak of it any longer; and, in the inn at which they stopped and took a light meal in the nearest village, it was she who asked the landlord about the abandoned chateau. But she learnt nothing from him, for the man was new to the district and could give her no particulars. He did not even know the name of the owner.

They turned their horses' heads towards La Mareze. Again and again Hortense recalled the squalid sight which had met their eyes. But Renine, who was in a lively mood and full of attentions to his companion, seemed utterly indifferent to those questions.

"But, after all," she exclaimed, impatiently, "we can't leave the matter there! It calls for a solution."

"As you say," he replied, "a solution is called for. M. Rossigny has to know where he stands and you have to decide what to do about him."

She shrugged her shoulders: "He's of no importance for the moment. The thing to-day...."

"Is what?"

"Is to know what those two dead bodies are."

"Still, Rossigny...."

"Rossigny can wait. But I can't. You have shown me a mystery which is now the only thing that matters. What do you intend to do?"

"To do?"

"Yes. There are two bodies.... You'll inform the police, I suppose."

"Gracious goodness!" he exclaimed, laughing. "What for?"

"Well, there's a riddle that has to be cleared up at all costs, a terrible tragedy."

"We don't need any one to do that."

"What! Do you mean to say that you understand it?"

"Almost as plainly as though I had read it in a book, told in full detail, with explanatory ill.u.s.trations. It's all so simple!"