Eldon Hall is one of those fine old country mansions so much admired, and not infrequently coveted by, rich Americans who come over to "do England."

It was the late Colonel North, of nitrate fame, who, upon visiting Killeen Castle, in County Meath, with a view to buying the place for his son, laconically observed: "Yes, it's not a bad old pile, but much too ramshackle for my son. I could manage to live in it, I dare say, but if my son buys it he'll pull it down and rebuild it," a remark which tickled its owner a good deal.

Eldon Hall, in Northumberland, is fully as old and in some respects as venerable a "pile" as Killeen Castle, though its architecture is wholly different. Many attempts have been made to fix the date of Eldonthe property has been in Lord Cranmere's family "from a period," as the lawyers say, "so far back that the memory of man runneth not to the contrary"but experts differ considerably in their opinions.

This is due to the fact that though a portion of the old place is undoubtedly Elizabethan, there yet are portions obviously of a much earlier date. According to several authorities the earlier building must at some period have been in part destroyed, most probably, they say, by fire, the portion left intact being then deserted for generations, and, towards the end of the sixteenth century, inhabited again, when, it is further conjectured, the latter part must have been built. The effect produced by this architectural medley is bizarre in the extreme, and many and strange are the local legends and traditions connected with Eldon Hall.

Situated on the slope of a gigantic ravine, twelve miles from the nearest town, and eight from the nearest railway station, and the roads in that part of Northumberland being far from good, until the advent of the automobile Eldon Hall was looked upon by many as, in a sense, inaccessible.

The house being far from the beaten track, few excursionists or trippers came near the place in those days, and, indeed, even to-day the sightseers who find their way there are for the most part Americans. From the ridge of hills which shuts in and practically surrounds the estatehills all densely woodeda panoramic and truly glorious view can be obtained of the wonderfully picturesque scenery that unfolds itself on all sides. Here, then, it was that, on the 28th day of February, 1912, many hundreds of people from all parts of the country, exclusive of local residents and of Lord Cranmere's own tenantry, were to assemble for a week of festivity and rejoicing which, so rumour said, would eclipse anything of the kind ever before seen at Eldon, which long had been famous for its "outbursts" of entertainment.

Lord Cranmere's elder son, who was about to come of age, was like the typical athletic young Briton. Tall, well-built, handsome, with plenty of self-assurance and a wholly unaffected manner, he was worthy of his father's pride. It was no exaggeration to say that everybody, rich and poor alike, who came into contact with him, at once fell under the spell of his attractive personality. A popular man himself Lord Cranmere had always been, but his outlook upon life was somewhat narrowin spite of his opportunities he had seen little of life and had few interests beyond fox-hunting, game-shooting and salmon-fishing. His eldest son, on the contrary, had, from the age of eighteen, travelled constantly. Twice already he had been round the world, and so quick was his power of observation that at twenty-one he knew more of life and of things that matter than many a man of his class and twice his age.

It was a glorious morning, the sun shining brightly, and strangely warm for February, as the car in which I had travelled from London with three companions, all of them Scotland Yard men, pulled up at a farmhouse within two miles of Eldon. The journey from London, begun at three in the morning on the previous day, had been broken at Skipton, near Harrogate, where we had spent the night. Now, as the five of usfor our driver was also, I discovered, a member of the forcewalked briskly along the narrow, winding lane in the direction of the park which surrounds Eldon Hall, the morning air was refreshing, also intensely invigorating.

We looked little enough like London men, and I doubt whether anybody meeting us would for an instant have supposed that we were not what we intended that we should look like, namely well-to-do tenantry of Lord Cranmere's bound for the scene of the coming-of-age festivities. It was barely nine o'clock, and at eleven the morning's sports were to begin. Several carts overtook us, loaded with cheery fellows; some of whom shouted rustic jests as they passed us by, which my companions were quick to acknowledge. We had walked, I suppose, rather less than a mile, when we suddenly came to a stile.

"Here's our short cut," the man who walked beside me said, as he stopped abruptly. "Many's the time I've climbed over this stile more years ago than I like to think, sir," he remarked lightly. "My father was under-keeper to his lordship's father, and I've not been back since twenty years. It's not a bit changed, though, the old place, not a bit, I'm going, when I retire on my pension, to live down here again. I want to leave my bones where I was born, and where my father's and mother's are. It's a fine country, this sir, not a county like it in the whole of England," he added with enthusiasm. "And you see yonder cross-roads? That's Clun Crossthere's said to be a highwayman buried at that cross-roads with a stake pushed through his body."

"Clun Cross." I remembered the name at once. It was the name that had appeared in one of the advertisements deciphered by Dick.

We made our way up the steep footpath which led across a cramped field. Now we were on the boundary of a thickly underwooded cover.

"There's not a tree in this wood I don't remember," he said, looking about him as we scrambled up the bridle path. Bracken up to our waists was on both sides, and it grew and hung over so thickly that the path was barely visible. As we reached the top of the track he gave a low whistle. Instantly the whistle was answered. A moment later half a dozen men rose up out of the undergrowth.

At the foot of a clump of pine trees in the middle of the wood, we lay down to confer. Then it was I learned, for the first time, something of the line of action the police had decided to adopt.

Forty police officers in various disguises, the majority dressed to look like the tenantry in their holiday clothes, were, it seemed, concealed in the various covers, in addition to a dozen disguised as labourers, stationed in fields beside the roads leading to Eldon Hall.

Besides these were fifteen officers, guests to all appearance, who would arrive with the other guests and mingle with them freely. There were also eight men disguised as hired waiters, who would help the servants below stairs in the Hall, and five female detectives assisting the maids in their work.

"You've got the revolver I gave you?" the gamekeeper's son said, turning to me suddenly. His name, he had told me, was Ross.

"Yes, though I all but forgot it."

"Let me see it," he said.

I produced it from my pocket, and handed it over.

"I thought so!" he exclaimed. "Not loaded." He loaded it with the cartridges I gave him, then gave it back to me.

Half an hour passed. One by one the men had risen and wandered away. Now only three remained. Ten minutes later two more rose and went, leaving me alone with Ross. His reminiscences of game-keepinga calling he seemed still to loveand of the former Lord Cranmere and his relations and his friends, also his experiences during the eighteen years he had been in the police force, were interesting to listen to. Brighter and brighter the sun shone. The weather was almost spring-like and no breath of wind stirred. Half a mile or so away, in the valley far beneath us, well-dressed men and women sauntered in the gardens and out upon the lawns. Larger and larger grew the number of these guests. From varying distances came the sound of cars rapidly approaching. In the broad, flat meadow, far down to our right, sports of different sorts were in progress. Beyond them were swings and similar attractions where children in their hundreds thronged and clustered. In all directions flew flags and bunting, while the sharp reports of the shooting-gallery rifles were audible above the blare of the roundabouts' steam organs.

Ross pulled out his field glass, and, kneeling up in the deep bracken, focussed the crowds in turn. It was now past noon. From the lawn facing the house the strains of a Strauss valse, played by an excellent band, floated up to where we knelt, though the racket of the steam organs clashed with it to some extent.

Slowly the time crept on. Longer and longer grew the approaching queue of cars. In one field alone, set aside as a garage, I counted over a hundred. Others were left out in the stable yards. Others could be seen, deserted by the roadsides. Beyond the band upon the lawn mammoth marquees had been erected, in which lunch for the vast concourse would presently be served. Already servants in their dozens hurried in and out as they made ready for the feast.

"About the queerest job I've ever had a hand in, this is," Ross observed presently, lowering his glass. "What do you make of it, Mr. Berrington?"

"Nothing as yet," I answered. "What puzzles me iswhy did they want to bring me here?"

Ross chuckled.

"He's most likely got some reason," he presently murmured. "I don't suppose Albeury'd fetch you here for your health."

Again he focussed his glass. Now the people were gradually drifting. Slowly the crowds began to surge in the direction where the tents stood. Now the tents were filling fast. Once more the band was playing. Everyone seemed happy. Joy and laughter were in the air. Engrossed in the panorama which interested me considerably, all thought of my reasons for being there had for the moment faded from my mind, and"

"Hark!" Ross exclaimed.

He remained silent, listening.

"What did you hear?" I asked, when half a minute had passed.

"Didn't you hear it?"

"No. What?"

"That buzzing sound. It wasn't a car, I'm certain. I believe it was athere, listen!"

I heard it now, distinctly. Away to our right it sounded, high in the air, apparently; a strange, humming noise.

"An aeroplane?"

He nodded.

Quickly the sound increased in volume. Now we saw that the crowds down in the valley had heard it. They were gazing up in the sky, away to our right. Now they were getting excited. Like ants they hurried about. Out of the tents they swarmed, like bees out of a hive that has been stirred up with a stick. And now out of the house, too, they came hurryingguests, men and maidservants, hired helpers, everybody.

The humming grew louder and louder.

"'Scot! What an idea!"

"Idea?" I exclaimed. "What do you mean?"

"We'd a rumour before leaving town that something unexpected and startling might occur in connection with this affair. This is it, you may depend."

Still I was perplexed.

"I don't follow your line of thought," I said. "What can an aeroplane have to do with the gang, or they with it? They wouldn't come down in an aeroplane to commit a robbery, surely?"

He looked at me, as I thought, pityingly, as though sorry for my lack of imagination, or intelligence, or both.

Now everybody was rushing about; all were hurrying in one direction; a few later stragglers still came stumbling out of the house, running as fast as their legs would carry them. The humming sounded just above our heads. Looking up, we suddenly saw the aeroplane.

A large biplane, containing two passengers, it passed not thirty feet above us, flying horizontally in a straight line. Now it descended a little way, then slowly began to circle. At that moment we heard a shot, fired somewhere in the woods.

"Our signal," Ross murmured. "Are you ready to go?"

"Go where?"

"You'll see."

The aeroplane was descending rapidly. Almost immediately beneath it was gathered a dense crowd. Looking through Ross's glass, I saw one of the passengers waving to the crowd to clear out of the way. A moment later, and the biplane was dashing straight at the people beneath.

"Quick! My glass."

I handed it to him. Instantly he levelled it in the direction of the house.

"See those men?" he said, pointing.

I turned in the direction he was looking. In the main road, just beyond the house, two men seemed to be busy with a large car. As I looked, a third man appeared in the roadway, walking quickly towards them. He stepped into the car behind the one where the two men already were, and, crouching, was at once lost to sight.

"Comequickly!" Ross exclaimed. "You see the idea now? That aeroplane arrival is a ruse to distract everybody's attention. There's never been an aeroplane up here before. This is the first time most of that crowd, except the guests, have ever seen one. When we get into the house you'll find it completely desertedor apparently so. But some of the gang will be busy there, that you may depend uponour men are already there."

With all speed we scrambled through the bracken and down the steep slope towards the house. In five minutes or less we were within fifty yards of Eldon Hall.

The back door stood wide open. Entering cautiously, we found ourselves in the kitchen premises. Kitchen, pantry, every room and the stone-flagged passages were deserted. A moment or two later we pushed open a spring door, to find ourselves in the hall. Nobody was there either, and the front door stood ajar.

"Off with your bootsquick!"

A glance into the various downstair rooms, all of which were deserted, then up the front stairs we crept in our stockinged feet. On the landing two men stepped noiselessly out of a doorway. Both, I saw, were detectives in rubber shoes.

"You know the men of the gang by sight?" one of them whispered, as he stood beside me.

"Some of them," I answered.

"And they know who you are, we understand."

"Yes."

"Then if you meet oneshoot! He'll shoot you if you don't shoot first."

My hand trembled with excitement as I clutched the pistol in my pocket. My mouth was dry. I could hear my heart thumping. Cautiously I followed Ross along the corridor.

Suddenly a loud report almost deafened me. At the same instant Ross fell forward on to his face, with a hideous crashI can hear it now as I think of it. A moment later a man dashed past me, and tore furiously down the stairs. Springing after him I fired wildly as he ranoncetwice. I had missed him and he was gone. In one of the rooms I could distinctly hear sounds of a scuffle. There were blows, some oaths and a muffled groan. Now the house was suddenly in uproar. The deafening sound of several shots echoed along the corridors. Two men were running towards me. Wildly I flung out my arm, the revolver in my hand aimed point blank at one of them, and then

Something struck me from behind, a fearful blow, and, stumbling, I lost consciousness.

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I was in a room, almost in darkness. Like shadows two figures moved noiselessly about. They were figures I didn't recognize. My head ached fearfully. Where was I? What had happened? I remember groaning feebly, and seeing the two figures quickly turn towards me.

Again all was blank.

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