"The escape must have been intermittent. If wind blew down the cutting, as probably was the case before this frost set in, it would keep the gas so diluted that its effects would not be noticed. There was enough down here this morning, before that train came through, to poison an army.

Indeed, if it had not been for Henderson's prompt.i.tude, there would have been another inquest--on myself."

I then related my own experience.

"Well, this clears Wynne, without doubt," said Bainbridge; "but alas!

for the two poor fellows who were victims. Bell, the Lytton Vale Railway Company owe you unlimited thanks; you have doubtless saved many lives, and also the Company, for the line must have been closed if you had not made your valuable discovery. But now come home with me to breakfast. We can discuss all those matters later on."

IV

THE EIGHT-MILE LOCK

It was in the August of 1889, when I was just arranging my annual holiday, that I received the following letter. I tore it open and read:--

"_Theodora_ House-boat, Goring.

"Dear Mr. Bell,--

"Can you come down on Wednesday and stay with us for a week? The weather is glorious and the river looking its best. We are a gay party, and there will be plenty of fun going on.

"Yours very truly, "Helena Ridsdale."

This was exactly what I wanted. I was fond of the river, and scarcely a summer pa.s.sed that I did not spend at least a fortnight on the Thames.

I could go for a week to the Ridsdales, and then start off on my own quiet holiday afterwards. I had known Lady Ridsdale since she was a girl, and I had no doubt my visit would prove a most enjoyable one. I replied immediately, accepting the invitation, and three days later arrived at Goring.

As the well-cushioned little punt, which had been sent to bring me across the river, drew up alongside the _Theodora_, the Countess came down from the deck to welcome me.

"I am so glad you could come, Mr. Bell," she said. "I was afraid you might be away on some of your extraordinary campaigns against the supernatural. This is Mr. Ralph Vyner; he is also, like yourself, devoted to science. I am sure you will find many interests in common."

A short, thickset, wiry little man, dressed in white flannels, who had been lolling in a deck chair, now came forward and shook hands with me.

"I know of you by reputation, Mr. Bell," he said, "and I have often hoped to have the pleasure of meeting you. I am sure we shall all be anxious to hear of some of your experiences. We are such an excessively frivolous party that we can easily afford to be leavened with a little serious element."

"But I don't mean to be serious in the least," I answered, laughing; "I have come here to enjoy myself, and intend to be as frivolous as the rest of you."

"You will have an opportunity this evening," said the Countess; "we are going to have a special band from town, and intend to have a moonlight dance on deck. Ah! here comes Charlie with the others," she added, shading her eyes and looking down the stream.

In a few moments a perfectly appointed little electric launch shot up, and my host with the rest of the party came on board. We shortly afterwards sat down to lunch, and a gayer and pleasanter set of people I have seldom met. In the afternoon we broke up into detachments, and Vyner and I went for a long pull up stream. I found him a pleasant fellow, ready to talk at any length not only about his own hobbies, but about the world at large. I discovered presently that he was a naval engineer of no small attainments.

When we returned to the house-boat, it was nearly time to prepare for dinner. Most of the ladies had already retired to their cabins. Lady Ridsdale was standing alone on deck. When she saw us both, she called to us to come to her side.

"This quite dazzles me," she said in a low, somewhat mysterious tone, "and I must show it to you. I know you at least, Mr. Vyner, will appreciate it."

As she spoke she took a small leather case out of her pocket--it was ornamented with a monogram, and opened with a catch. She pressed the lid, it flew up, and I saw, resting on a velvet bed, a glittering circlet of enormous diamonds. The Countess lifted them out, and slipped them over her slender wrist.

"They are some of the family diamonds," she said with excitement, "and of great value. Charlie is having all the jewels reset for me, but the rest are not ready yet. He has just brought this down from town. Is it not superb? Did you ever see such beauties?"

The diamonds flashed on her white wrist; she looked up at me with eyes almost as bright.

"I love beautiful stones," she said, "and I feel as if these were alive.

Oh, do look at the rays of colour in them, as many as in the rainbow."

I congratulated Lady Ridsdale on possessing such a splendid ornament, and then glanced at Vyner, expecting him to say something.

The expression on his face startled me, and I was destined to remember it by-and-by. The ruddy look had completely left it, his eyes were half starting from his head. He peered close, and suddenly, without the slightest warning, stretched out his hand, and touched the diamonds as they glittered round Lady Ridsdale's wrist. She started back haughtily, then, recovering herself, took the bracelet off and put it into his hand.

"Charlie tells me," she said, "that this bracelet is worth from fifteen to twenty thousand pounds."

"You must take care of it," remarked Vyner; "don't let your maid see it, for instance."

"Oh, nonsense!" laughed Lady Ridsdale. "I would trust Louise as I would trust myself."

Soon afterwards we separated, and I went down to my little cabin to prepare for dinner. When we met in the dining saloon I noticed that Lady Ridsdale was wearing the diamond bracelet. Almost immediately after dinner the band came on board and the dancing began.

We kept up our festivities until two o'clock, and more than once, as she flashed past me, I could not help noticing the glittering circlet round her wrist. I considered myself a fair judge of precious stones, but had never seen any diamonds for size and brilliancy to equal these.

As Vyner and I happened to stand apart from the others he remarked upon them.

"It was imprudent of Ridsdale to bring those diamonds here," he said.

"Suppose they are stolen?"

"Scarcely likely," I answered; "there are no thieves on board."

He gave an impatient movement.

"As far as we _know_ there are not," he said slowly, "but one can never tell. The diamonds are of exceptional value, and it is not safe to expose ordinary folk to temptation. That small circlet means a fortune."

He sighed deeply, and when I spoke to him next did not answer me. Not long afterwards our gay party dispersed, and we retired to our respective cabins.

I went to mine and was quickly in bed. As a newly-arrived guest I was given a cabin on board, but several other members of the party were sleeping in tents on the sh.o.r.e. Vyner and Lord Ridsdale were amongst the latter number. Whether it was the narrowness of my bunk or the heat of the night, I cannot tell, but sleep I could not. Suddenly through my open window I heard voices from the sh.o.r.e near by. I could identify the speakers by their tones--one was my host, Lord Ridsdale, the other Ralph Vyner. Whatever formed the subject of discourse it was evidently far from amicable. However much averse I might feel to the situation, I was compelled to be an unwilling eavesdropper, for the voices rose, and I caught the following words from Vyner:

"Can you lend me five thousand pounds till the winter?"

"No, Vyner, I have told you so before, and the reason too. It is your own fault, and you must take the consequences."

"Do you mean that to be final?" asked Vyner.

"Yes."

"Very well, then I shall look after myself. Thank G.o.d, I have got brains if I have not money, and I shall not let the means interfere with the end."

"You can go to the devil for all I care," was the angry answer, "and, after what I know, I won't raise a finger to help you."

The speakers had evidently moved further off, for the last words I could not catch. But what little I heard by no means conduced to slumber. So Vyner, for all his jovial and easy manner, was in a fix for money, and Ridsdale knew something about him scarcely to his credit!