"Is it swifter than the horse which his Majesty keeps for his own use at Dunfermline?" asked the soldier curiously. "For if it is, it must indeed be a noble animal, and 'twould fetch a good price among the barons of the court. Ever since his Majesty has turned his mind so much to horses, his courtiers have vied with each other to see which of them could become the possessor of the swiftest animal."

"My horse is not for sale," said Sir Michael shortly, "not though men offered me his weight in gold."

The young officer bowed again. There was something in Sir Michael's tone which forbade him asking to see the horse, much as he should have liked to do so; so, giving a signal to his men, he turned his horse's head in the direction of Edinburgh, and rode off, leaving Sir Michael standing on the doorstep gazing after them, a strange smile on his face.

"A good price," he repeated; "by my troth, 'twould need to be a very good price which would buy my good Diabolus from me. But I must go and summon him."

Muttering strangely to himself, he turned and entered the tower.

He went up the narrow, winding, stone stairs until he reached a little iron-studded door. This door was locked, but he opened it with a key which hung from his girdle, and, entering the low-roofed attic-room to which it led, he locked it again carefully behind him. The attic was at the top of the tower, and through the narrow windows which pierced three of its walls, a glorious view was to be had over the surrounding country.

But Sir Michael had not come up there to admire the view; he had other work to do—work which seemed to need mysterious preparations.

First of all, he proceeded to dress himself in a curiously shaped black cloak, and a hunting cap made of hair, which he took down from a nail in the wall. The cloak was very long, and completely enveloped his figure, and, when he had pulled the hairy cap well down over his eyes, no one would have taken him, I warrant, for the quiet, middle-aged, master of Oakwood.

When he was dressed he took down a leaden platter from a shelf by the door, and, opening a cupboard, he took out a little glass bottle full of a clear amber-coloured liquid, which glowed like melted fire. Setting down the platter on a little round table in the middle of the room, he dropped one or two drops of this liquid on it, and in an instant they broke into tongues of flame which curled up high above his head.

It was a strange and weird fire, enough to frighten any man, but the still, dark-robed figure standing beside it never moved, not even when a number of tiny little imps appeared, clad in scarlet, and green, and blue, and purple, and danced round and round it on the table, tossing their tiny arms, and twisting their queer little faces, as if they had gone mad.