Slowly, and with a step no louder than the beating of his own heart, he went upwards, glancing in midway upon the banquet hall, where the dim light from the postern without revealed a number of dark forms wrapped in slumber lying on the dining-table and on the floor; ascending yet higher he came to the floor where slept the Countess of Douglas, the Lady Sybilla, and in the Earl's own chamber the Marshal de Retz, ambassador of the King of France.

Sholto stood a moment with his hand raised in a listening attitude, before he ventured to ascend those narrower stairs which led to the uppermost floor of all, on which were the chambers occupied by the little Maid Margaret and her companion and gossip Mistress Maud Lindesay.

He told himself that it was his duty to see to the safety of the whole castle; that he had special instructions to visit three times, during the course of each night of duty, all the passages and corridors of the fortress. But nevertheless it needed all his courage to enable Sholto to perform the task which had been laid upon him. As he dragged one foot after the other up the turret stairs, it seemed as if a leaden clog had been attached to each pointed shoe.

He had also a vague sense of being watched by presences invisible to him, but malign in their nature. Again and again he caught himself listening for footsteps which seemed to dog his own. He heard mysterious whisperings that flouted his utmost vigilance, and mocking laughter that lurked in unseen crevices and broke out so soon as he had passed.

Sholto set his hand firmly upon his sword handle and bit his lips, lest even to himself he should own his uneasiness. It was not seemly that the captain of the Douglas guard should be frightened by shadows.

Passing the corridor which led towards the sleeping rooms of the maid and her companion, he ascended to the roof of the castle, thrusting aside the turret door and issuing upon the wide, open spaces with an assured step. The cool breeze from the west restored him to himself in a moment. The waning moon cast a pale light across the landscape, and he could see the tents on the castle island glimmer greyish white beneath him. Beyond that again was the shining confluence of the sluggish river about the isle, and the dark line of the woods of Balmaghie opposite. He had begun to meditate on the rapid changes of circumstance which had overtaken him, when suddenly a shrill and piercing shriek rang out, coming up through the castle beneath, again and again repeated. It was like the cry of a child in the grip of instant and deadly terror.

Sholto's heart gave a great bound. That something untoward should happen on this the first night of his charge was too disastrous. He drew his sword and set in his lips the silver call which depended from the chain of office the Earl had thrown about his neck when he made him captain of his guard.

His feet hardly touched the stone stairs as he flew downwards, and wings were added to his haste by the sounds of fear which continued to increase. In another moment he was upon the last step of the turnpike and at the entrance of the corridor which led to the rooms of the little Lady Margaret and Maud Lindesay.

As Sholto came rushing down the steep descent from the roof he caught sight of a dark and shaggy beast running on all fours just turning out of the corridor, and taking the first step of the descent towards the floor beneath. Without pausing to consider, Sholto lunged forward with all his might, and his sword struck the fugitive quadruped behind the shoulder. He had time to see in the pale bluish flicker of the cruisie lamp that the beast he had wounded was of a dark colour, and that its head seemed immensely too large for its body.

Nevertheless, the thing did not fall, but ran on and vanished out of Sholto's sight. The young man again set the silver call to his lips and blew. The next moment he could hear the soldiers of the guard clattering upward from their hall, and he himself ran along the corridor towards the place whence the screams of terror seemed to proceed.