Puttler walked over to the bed. The mattress had been half dragged to the floor, but the pillows were still in their place, and one of these and a part of the under sheet were smothered with blood.

Dick examined the open window. Three or four of the leaded panes were broken, and the steel rod that kept the windows open was bent as though a heavy weight had rested upon it. The ground was about fifteen feet below, and immediately under the window a large rhododendron bush had been broken as though by some heavy weight dropped upon it. Without hesitation, Dick threw his legs across the window sill, poised himself a moment and dropped to the ground. There was blood on the leaves of the bush; he could find no footprints. Searching the ground, he came upon a smudge of blood against one of the buttresses of the wall.

By this time Puttler, who had chosen a more sedate method of descent, had joined him, and the two men went on, keeping to the paved path, and searched the ground for a further trail.

“This happened when we were in the grounds with the local police,” said Puttler.

He had been full of self-reproaches all night, and now Dick silenced him.

“It can’t be helped,” he said. “The fault is as much mine as yours. I ought to have expected this, after the killing of Thomas. Knowing what I know, I should have gone up to his room and stayed there with him, or at least outside. Poor old Harry! Poor old boy!”

His voice broke, and for a second there were tears in his eyes.

“What is this?”

The paving ended abruptly and was continued by a rolled gravel path, and there were marks here of something heavy being dragged along. These ceased as suddenly as the paving.

“Wait,” said Dick, as the solution dawned upon him.

He ran back along the wall of the wing, turned the corner, and stopped before the first of the library windows. It was open, and, drawing himself up, he dropped into the darkened room and pulled back the curtains. So far he had not examined the library; his practised eye, familiar with almost every book on the shelves, told him that somebody had been here. One section of the shelves had been almost cleared. A drawer in Harry’s desk had been broken open, and on the floor he found an empty cash-box.

He made a brief and hurried survey, and, returning to the open by the window, he rejoined the detective and told him of his discovery.

Beyond the gravelled path and the dragging marks, all trace of Harry was lost. Ahead of them, at a distance of four or five hundred yards, was the river. To the left, and at this point out of sight, were the abbey ruins.