All was perfectly quiet, not a sound broke the silence of the night; one solitary light, that of the housekeeper, was burning in the house.

This silence and this darkness emboldened Boxtel; he got astride the wall, stopped for an instant, and, after having ascertained that there was nothing to fear, he put his ladder from his own garden into that of Cornelius, and descended.

Then, knowing to an inch where the bulbs which were to produce the black tulip were planted, he ran towards the spot, following, however, the gravelled walks in order not to be betrayed by his footprints, and, on arriving at the precise spot, he proceeded, with the eagerness of a tiger, to plunge his hand into the soft ground.

He found nothing, and thought he was mistaken.

In the meanwhile, the cold sweat stood on his brow.

He felt about close by it, -- nothing.

He felt about on the right, and on the left, -- nothing.

He felt about in front and at the back, -- nothing.

He was nearly mad, when at last he satisfied himself that on that very morning the earth had been disturbed.

In fact, whilst Boxtel was lying in bed, Cornelius had gone down to his garden, had taken up the mother bulb, and, as we have seen, divided it into three.

Boxtel could not bring himself to leave leave the place. He dug up with his hands more than ten square feet of ground.

At last no doubt remained of his misfortune. Mad with rage, he returned to his ladder, mounted the wall, drew up the ladder, flung it into his own garden, and jumped after it.

All at once, a last ray of hope presented itself to his mind: the seedling bulbs might be in the dry-room; it was therefore only requisite to make his entry there as he had done into the garden.

There he would find them, and, moreover, it was not at all difficult, as the sashes of the dry-room might be raised like those of a greenhouse. Cornelius had opened them on that morning, and no one had thought of closing them again.

Everything, therefore, depended upon whether he could procure a ladder of sufficient length, -- one of twenty-five feet instead of ten.

Boxtel had noticed in the street where he lived a house which was being repaired, and against which a very tall ladder was placed.

This ladder would do admirably, unless the workmen had taken it away.

He ran to the house: the ladder was there. Boxtel took it, carried it with great exertion to his garden, and with even greater difficulty raised it against the wall of Van Baerle's house, where it just reached to the window.

Boxtel put a lighted dark lantern into his pocket, mounted the ladder, and slipped into the dry-room.

On reaching this sanctuary of the florist he stopped, supporting himself against the table; his legs failed him, his heart beat as if it would choke him. Here it was even worse than in the garden; there Boxtel was only a trespasser, here he was a thief.

However, he took courage again: he had not gone so far to turn back with empty hands.

But in vain did he search the whole room, open and shut all the drawers, even that privileged one where the parcel which had been so fatal to Cornelius had been deposited; he found ticketed, as in a botanical garden, the "Jane," the "John de Witt," the hazel-nut, and the roasted-coffee coloured tulip; but of the black tulip, or rather the seedling bulbs within which it was still sleeping, not a trace was found.

My mind filled with admiration for this extraordinary man.

“You have solved it!” I cried.

“Hardly that, Watson. There are some points which are as dark as ever. But we have so much that it will be our own fault if we cannot get the rest. We will go straight to Whitehall Terrace and bring the matter to a head.”

When we arrived at the residence of the European Secretary it was for Lady Hilda Trelawney Hope that Sherlock Holmes inquired. We were shown into the morning-room.

“Mr. Holmes!” said the lady, and her face was pink with her indignation. “This is surely most unfair and ungenerous upon your part. I desired, as I have explained, to keep my visit to you a secret, lest my husband should think that I was intruding into his affairs. And yet you compromise me by coming here and so showing that there are business relations between us.”

“Unfortunately, madam, I had no possible alternative. I have been commissioned to recover this immensely important paper. I must therefore ask you, madam, to be kind enough to place it in my hands.”

The lady sprang to her feet, with the colour all dashed in an instant from her beautiful face. Her eyes glazed — she tottered — I thought that she would faint. Then with a grand effort she rallied from the shock, and a supreme astonishment and indignation chased every other expression from her features.

“You — you insult me, Mr. Holmes.”

“Come, come, madam, it is useless. Give up the letter.”

She darted to the bell.

“The butler shall show you out.”

“Do not ring, Lady Hilda. If you do, then all my earnest efforts to avoid a scandal will be frustrated. Give up the letter and all will be set right. If you will work with me I can arrange everything. If you work against me I must expose you.”

She stood grandly defiant, a queenly figure, her eyes fixed upon his as if she would read his very soul. Her hand was on the bell, but she had forborne to ring it.

“You are trying to frighten me. It is not a very manly thing, Mr. Holmes, to come here and browbeat a woman. You say that you know something. What is it that you know?”

“Pray sit down, madam. You will hurt yourself there if you fall. I will not speak until you sit down. Thank you.”

“I give you five minutes, Mr. Holmes.”

“One is enough, Lady Hilda. I know of your visit to Eduardo Lucas, of your giving him this document, of your ingenious return to the room last night, and of the manner in which you took the letter from the hiding-place under the carpet.”

She stared at him with an ashen face and gulped twice before she could speak.

“You are mad, Mr. Holmes — you are mad!” she cried, at last.

He drew a small piece of cardboard from his pocket. It was the face of a woman cut out of a portrait.

“I have carried this because I thought it might be useful,” said he. “The policeman has recognized it.”