"He knows something is wrong, or he wouldn't be upset like this," she thought.

Again from the darkness outside came that curious subdued scraping sound. Their bedroom was over the porch. Could a strange dog be scratching at the door beneath? Or some wild animal—a weasel or a stoat, perhaps—be seeking an entrance?

She leaned cautiously from the window, trying in vain to distinguish any object. Her heart was beating fast, and she was trembling with nervousness. The noise ceased again, there was a moment's pause, and for one second she saw a gleam of light in the garden below. Instantly a sudden illumination swept over her mind: it was neither rat, bird, dog, stoat, nor weasel, but a human being that was disturbing their peace.

"Gwethyn," she breathed in a panic-stricken whisper, "somebody is trying to break in through the dining-room window!"

At the very suggestion of burglars Gwethyn gave a shriek of terror, which set Tony barking loudly enough to have disturbed the Forty Thieves. So furious was his anger against the unknown intruder, that he would have leaped through the window if she had not held him by the collar. All his doggish instincts urged him to defend his mistresses, and he was ready to fly at the throat of whoever had set foot in the garden below.

The noise disturbed the other occupants of the landing. The girls came running from their rooms to inquire the cause of the upset. Mrs. Franklin appeared upon the scene with the promptitude of fire-drill practice. On grasping the fact that an attempt was being made to break into the house, she ran to the big school bell, and tolled an alarm signal calculated to waken the whole village. She went on ringing vigorously until shouts and running footsteps outside assured her of help.

Mr. White, from the farm near at hand, and some of his boys were the first to arrive, but they were followed almost immediately by the blacksmith, the saddler, and a number of cottagers, till quite a little crowd had collected in the drive. Mrs. Franklin hastily explained the situation, and some of the men, taking lanterns, made a thorough examination of the premises.

This midnight alarm caused a great stir in Heathwell. Such a thing as an attempted burglary had hitherto been absolutely unknown, and the inhabitants felt that it was a reflection on the village. The policeman paid a solemn call at Aireyholme, produced his notebook, and asked a multitude of questions, particularly of Katrine and Gwethyn; but the girls could give little or no information. Beyond the fact that they had heard a noise and seen a light in the garden, there was not a shred of evidence, or the faintest clue to lead to the identification of the thief. The inspector examined the frame of the dining-room window, which certainly bore marks as if an effort had been made to force it with some sharp tool, and he carefully measured the footprints in the flower-bed; but as many of these had undoubtedly been made by the stalwart boots of Mr. White and other assiduous helpers in the ardour of their search, it would have been impossible for even a Sherlock Holmes to gain any enlightenment from them. Nobody in the village had seen any suspicious characters about, and everyone seemed to have been sound asleep in bed until roused by the ringing of the Aireyholme alarm bell. In the end the policeman wrote a formal report to the effect that some person or persons unknown had made an attempt to commit a felony, but had been interrupted in the act by the barking of the dog.

"All of which is absolutely self-evident, and didn't need a whole hour's investigation," said Gwethyn. "Still, I suppose poor old Whately had to write something in his notebook. The chief credit seems to be due to Tony. I'm sure he scared the wretch away. I don't know what we should have done without him."

Tony was undoubtedly the hero of the occasion. If he had been petted before, he was lionized now. Even Mrs. Franklin admitted that a dog in the house was a great protection, and offered to let Gwethyn keep Tony at Aireyholme for the rest of the term.