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took the first opportunity of leaving the house, and on making inquiries I hear that she left London by the first train this morning, en route for the Continent. These facts may mean a great deal, and I should advise you to be more than ever on your guard."

I put the letter into my pocket, got Sousa to promise all that was necessary, and went away.

At an early hour the following morning we left Rocio Station for Coimbra, and it was nearly seven in the evening when we finally came to the end of our railway journey and entered a light wagonette
"A phlegmatic-looking man opened the door for us." drawn by two powerful bay stallions for our twenty-mile drive to the castle.

The scenery as we approached the spurs of the Estrella was magnificent beyond description, and as I gazed up at the great peaks, now bathed in the purples and golds of the sunset, the magic and mystery of our strange mission became tenfold intensified. Presently the steep ascent began along a winding road between high walls that shut out our view, and by the time we reached the castle it was too dark to form any idea of its special features.

De Castro had already sent word of our probable arrival, and when we rang the bell at the old castle a phlegmatic-looking man opened the door for us.

"Ah, Gonsalves," cried De Castro, "here we are! I trust you have provided comfortable beds and a good meal, for we are all as hungry as hawks."

The old man shrugged his shoulders, raised his beetle-brows a trifle, and fixed his eyes on Helen with some astonishment. He muttered, in a Portuguese dialect which I did not in the least comprehend, something to De Castro, who professed himself satisfied. Then he said something further, and I noticed the face of my Portuguese friend turn pale.

"Gonsalves saw the spectre three nights ago," he remarked, turning to me. "It was leaning as usual out of one of the windows of the north-west turret. But, come; we must not terrify ourselves the moment we enter your future home, Niece Helen. You are doubtless hungry. Shall we go to the banqueting-hall?"

The supper prepared for us was not appetizing, consisting of some miserable goat-chops, and in the great hall, dimly lighted by a few candles in silver sconces, we could scarcely see each other's faces. As supper was coming to an end I made a suggestion.

"We have come here," I said, "on a serious matter. We propose to start an investigation of a very grave character. It is well known that ghosts prefer to reveal themselves to one man or woman alone, and not to a company. I propose, therefore, that we three should occupy rooms as far as possible each from the other in the castle, and that the windows of our three bedrooms should command the centre square."

De Castro shrugged his shoulders and a look of dismay spread for a moment over his face; but Helen fixed her great eyes on mine, her lips moved slightly as though she would speak, then she pulled herself together.

"You are right, Mr. Druce," she said. "Having come on this inquiry, we must fear nothing."

"Well, come at once, and we will choose