When Lady Arabella had crept away in her usual noiseless fashion, the two others remained for a while in their places on the turret roof: Caswall because he had nothing to say, Mimi because she had much to say and wished to put her thoughts in order.  For quite a while—which seemed interminable—silence reigned between them.  At last Mimi made a beginning—she had made up her mind how to act.

“Mr. Caswall,” she said loudly, so as to make sure of being heard through the blustering of the wind and the perpetual cracking of the electricity.

Caswall said something in reply, but his words were carried away on the storm.  However, one of her objects was effected: she knew now exactly whereabout on the roof he was.  So she moved close to the spot before she spoke again, raising her voice almost to a shout.

“The wicket is shut.  Please to open it.  I can’t get out.”

As she spoke, she was quietly fingering a revolver which Adam had given to her in case of emergency and which now lay in her breast.  She felt that she was caged like a rat in a trap, but did not mean to be taken at a disadvantage, whatever happened.  Caswall also felt trapped, and all the brute in him rose to the emergency.  In a voice which was raucous and brutal—much like that which is heard when a wife is being beaten by her husband in a slum—he hissed out, his syllables cutting through the roaring of the storm:

“You came of your own accord—without permission, or even asking it.  Now you can stay or go as you choose.  But you must manage it for yourself; I’ll have nothing to do with it.”

Her answer was spoken with dangerous suavity

“I am going.  Blame yourself if you do not like the time and manner of it.  I daresay Adam—my husband—will have a word to say to you about it!”

“Let him say, and be damned to him, and to you too!  I’ll show you a light.  You shan’t be able to say that you could not see what you were doing.”

As he spoke, he was lighting another piece of the magnesium ribbon, which made a blinding glare in which everything was plainly discernible, down to the smallest detail.  This exactly suited Mimi.  She took accurate note of the wicket and its fastening before the glare had died away.  She took her revolver out and fired into the lock, which was shivered on the instant, the pieces flying round in all directions, but happily without causing hurt to anyone.  Then she pushed the wicket open and ran down the narrow stair, and so to the hall door.  Opening this also, she ran down the avenue, never lessening her speed till she stood outside the door of Lesser Hill.  The door was opened at once on her ringing.

“Is Mr. Adam Salton in?” she asked.

“He has just come in, a few minutes ago.  He has gone up to the study,” replied a servant.

She ran upstairs at once and joined him.  He seemed relieved when he saw her, but scrutinised her face keenly.  He saw that she had been in some concern, so led her over to the sofa in the window and sat down beside her.

“Now, dear, tell me all about it!” he said.

She rushed breathlessly through all the details of her adventure on the turret roof.  Adam listened attentively, helping her all he could, and not embarrassing her by any questioning.  His thoughtful silence was a great help to her, for it allowed her to collect and organise her thoughts.

“I must go and see Caswall to-morrow, to hear what he has to say on the subject.”

“But, dear, for my sake, don’t have any quarrel with Mr. Caswall.  I have had too much trial and pain lately to wish it increased by any anxiety regarding you.”

“You shall not, dear—if I can help it—please God,” he said solemnly, and he kissed her.

Then, in order to keep her interested so that she might forget the fears and anxieties that had disturbed her, he began to talk over the details of her adventure, making shrewd comments which attracted and held her attention.  Presently, inter alia, he said:

“That’s a dangerous game Caswall is up to.  It seems to me that that young man—though he doesn’t appear to know it—is riding for a fall!”

“How, dear?  I don’t understand.”

“Kite flying on a night like this from a place like the tower of Castra Regis is, to say the least of it, dangerous.  It is not merely courting death or other accident from lightning, but it is bringing the lightning into where he lives.  Every cloud that is blowing up here—and they all make for the highest point—is bound to develop into a flash of lightning.  That kite is up in the air and is bound to attract the lightning.  Its cord makes a road for it on which to travel to earth.  When it does come, it will strike the top of the tower with a weight a hundred times greater than a whole park of artillery, and will knock Castra Regis into pieces.  Where it will go after that, no one can tell.  If there should be any metal by which it can travel, such will not only point the road, but be the road itself.”

“Would it be dangerous to be out in the open air when such a thing is taking place?” she asked.

“No, little woman.  It would be the safest possible place—so long as one was not in the line of the electric current.”

“Then, do let us go outside.  I don’t want to run into any foolish danger—or, far more, to ask you to do so.  But surely if the open is safest, that is the place for us.”

Without another word, she put on again the cloak she had thrown off, and a small, tight-fitting cap.  Adam too put on his cap, and, after seeing that his revolver was all right, gave her his hand, and they left the house together.

“I think the best thing we can do will be to go round all the places which are mixed up in this affair.”

“All right, dear, I am ready.  But, if you don’t mind, we might go first to Mercy.  I am anxious about grandfather, and we might see that—as yet, at all events—nothing has happened there.”

So they went on the high-hung road along the top of the Brow.  The wind here was of great force, and made a strange booming noise as it swept high overhead; though not the sound of cracking and tearing as it passed through the woods of high slender trees which grew on either side of the road.  Mimi could hardly keep her feet.  She was not afraid; but the force to which she was opposed gave her a good excuse to hold on to her husband extra tight.

At Mercy there was no one up—at least, all the lights were out.  But to Mimi, accustomed to the nightly routine of the house, there were manifest signs that all was well, except in the little room on the first floor, where the blinds were down.  Mimi could not bear to look at that, to think of it.  Adam understood her pain, for he had been keenly interested in poor Lilla.  He bent over and kissed her, and then took her hand and held it hard.  Thus they passed on together, returning to the high road towards Castra Regis.

At the gate of Castra Regis they were extra careful.  When drawing near, Adam stumbled upon the wire that Lady Arabella had left trailing on the ground.

Adam drew his breath at this, and spoke in a low, earnest whisper:

“I don’t want to frighten you, Mimi dear, but wherever that wire is there is danger.”

“Danger!  How?”

“That is the track where the lightning will go; at any moment, even now whilst we are speaking and searching, a fearful force may be loosed upon us.  Run on, dear; you know the way to where the avenue joins the highroad.  If you see any sign of the wire, keep away from it, for God’s sake.  I shall join you at the gateway.”

“Are you going to follow that wire alone?”

“Yes, dear.  One is sufficient for that work.  I shall not lose a moment till I am with you.”

“Adam, when I came with you into the open, my main wish was that we should be together if anything serious happened.  You wouldn’t deny me that right, would you, dear?”

“No, dear, not that or any right.  Thank God that my wife has such a wish.  Come; we will go together.  We are in the hands of God.  If He wishes, we shall be together at the end, whenever or wherever that may be.”

They picked up the trail of the wire on the steps and followed it down the avenue, taking care not to touch it with their feet.  It was easy enough to follow, for the wire, if not bright, was self-coloured, and showed clearly.  They followed it out of the gateway and into the avenue of Diana’s Grove.

Here a new gravity clouded Adam’s face, though Mimi saw no cause for fresh concern.  This was easily enough explained.  Adam knew of the explosive works in progress regarding the well-hole, but the matter had been kept from his wife.  As they stood near the house, Adam asked Mimi to return to the road, ostensibly to watch the course of the wire, telling her that there might be a branch wire leading somewhere else.  She was to search the undergrowth, and if she found it, was to warn him by the Australian native “Coo-ee!”

Whilst they were standing together, there came a blinding flash of lightning, which lit up for several seconds the whole area of earth and sky.  It was only the first note of the celestial prelude, for it was followed in quick succession by numerous flashes, whilst the crash and roll of thunder seemed continuous.

Adam, appalled, drew his wife to him and held her close.  As far as he could estimate by the interval between lightning and thunder-clap, the heart of the storm was still some distance off, so he felt no present concern for their safety.  Still, it was apparent that the course of the storm was moving swiftly in their direction.  The lightning flashes came faster and faster and closer together; the thunder-roll was almost continuous, not stopping for a moment—a new crash beginning before the old one had ceased.  Adam kept looking up in the direction where the kite strained and struggled at its detaining cord, but, of course, the dull evening light prevented any distinct scrutiny.

At length there came a flash so appallingly bright that in its glare Nature seemed to be standing still.  So long did it last, that there was time to distinguish its configuration.  It seemed like a mighty tree inverted, pendent from the sky.  The whole country around within the angle of vision was lit up till it seemed to glow.  Then a broad ribbon of fire seemed to drop on to the tower of Castra Regis just as the thunder crashed.  By the glare, Adam could see the tower shake and tremble, and finally fall to pieces like a house of cards.  The passing of the lightning left the sky again dark, but a blue flame fell downward from the tower, and, with inconceivable rapidity, running along the ground in the direction of Diana’s Grove, reached the dark silent house, which in the instant burst into flame at a hundred different points.

At the same moment there rose from the house a rending, crashin............