I was very glad that Polly had left school and come home for good. It was far more cheerful and pleasant than it had been at all since I left school. Polly made the place so cheerful with her bright happy smile, and was so full of life and fun, that I never found time to sit and muse, and wonder and fret over the future, as I had done before she came home. She never left me long alone for any time, but every day would make me go out for long walks with her, and indeed devoted herself entirely to cheering and amusing me. Papa too very much recovered his spirits under her genial influence; and altogether she made our home much brighter and more cheerful than before.  
So our life went on for nearly three months, and then one Friday evening I was told that Sarah was below waiting to speak to me. I was rather surprised, for she had been to the house very seldom before, and then always on Sunday evenings.
 
However, the moment she came in, I saw that she had something very important to tell. Her bright face was quite pale with excitement, and her whole figure was in a nervous tremble.
 
"Oh, miss," she burst out directly the door was closed behind her, "Oh, miss, I have found the secret door!"
 
Although I had tried all along to hope that she would some day do so, that hope had been so long deferred that it had almost died away; and now at the sudden news, I felt all the blood rush to my heart, the room swam round with me, and I sat on a chair quite overwhelmed by the sudden shock.
 
"Shall I get you some water, miss?"
 
"No, no, Sarah, I shall be myself in a minute or two."
 
I had to sit quiet a little time, before I could steady myself sufficiently to listen to the account of the wonderful discovery, which was to lead to fortune and happiness. Then I said,—
 
"I am not very strong, Sarah, and the surprise has been almost too much for me, for I own I hardly expected that you ever would find it. Now tell me all about it, or stay, let me ask papa and my sister to come in to share in this wonderful news of yours." So saying, I ran down to the study where papa was busy writing.
 
"Papa," I said, "I want you to come up stairs directly."
 
"What for my dear? I am really very busy at present."
 
"Never mind, papa; but put by your writing at once and come up. Sarah is here, and oh, papa, she has found the secret door."
 
"That is news, indeed!" papa said, pushing back his chair at once; "I am sure I never expected it."
 
So saying, he followed me upstairs. I called Polly as we went up, and she came running up after us, and as she went into the drawing-room with me, I whispered to her that the secret door was found. She gave me a little squeeze of congratulation, and I saw that even in that first flush of pleasure at the news, it was only the consequences to me that she thought of, and that her own personal interest in the matter never entered into her mind.
 
"Well, Sarah," papa began, "so I hear you have discovered the secret entrance at last."
 
"Yes sir, I have. From the time I found the first spring at Christmas, I have never ceased looking for another one. I had felt every knob on the fireplace and chimneypiece, and every stone up the chimney as far as I could reach. You know, sir, it is only in the half hour I get of a morning by being up before the other servants that I can try; indeed I only have half that time, for I must get some of the shutters open and appear to have began to do something to account for my time. Well, sir, at last I really seemed to have tried everywhere, and I almost gave up all hope of finding it, although I had quite made up my mind to go on searching as long as I stayed there, even if it was for ten years. Well, sir, yesterday morning I quite got out of temper with the thing, and I sat down on the ground in the great fireplace quite out of heart; my face was quite close to the great iron dogs, so I said, "Drat you, you look for all the world as if you were putting out your long tongues at me;" and I took hold of the tongue nearest to me, and gave it a twist, and do you know, sir, it quite gave me a turn to find that the tongue twisted round in my hand. I twisted and twisted till the tongue came out in my hand, then I touched the spring behind the mantel, but nothing moved; then I tried the tongue of the other dog, and that came out too; but still nothing moved. Just then I heard the cook moving in the kitchen, so I had to put the tongues back again and go to my work; but all day I hardly knew whether I stood on my head or my heels, I wanted so much to see whether anything would come of it. Well, miss, this morning I got up quite early, and unscrewed the dogs' tongues, and looked in the places they had come out of, but could not see anything. Then I pushed the sharp end of the tongue into the hole, and twisted and poked about, but I could not find anything moved; then I put that tongue in again, and tried the other, and directly I pushed the sharp end in, I felt something give way, and then I heard a click. I jumped up and pushed the knob in the chimney, and directly something creaked, and the whole of the left hand side of the fireplace swung open like a low door, about four feet high, and beyond it was a little flight of stone stairs. I was so excited, sir, when I saw the door and the steps, and knew I had found the place I had been looking for so long, that I had to lean against the wall to support myself. After a little while I pushed the door back again, and heard it close with a click. Then I screwed the tongue into the mouth again, and went about my work, but all day I have hardly known whether I stood upon my head or my heels."
 
We were all silent when Sarah finished. So far, then, we had succeeded in our search. What was to be done next? We turned to papa.
 
"You have indeed done well, Sarah, and have laid us under a deep obligation to you for the perseverance you have shown, and the clearness with which you have carried out my daughter's plans. But this we will talk about hereafter. The thing to be done now is to follow up your discovery. The most important point is to find out the size of the box or safe in which the will is kept in this secret room. If it is small enough to be carried away easily, our course will be very simple. If, on the other hand, the chest or safe should be too heavy to be moved, I shall first take a lawyer's opinion on the subject, and either get a search warrant, or else go quietly into the chamber with a locksmith, force the lock, and take out the will, which, when found, will be ample justification for our forcible entrance. The first thing to be done is for Sarah to examine the room, and to bring us word how large the box is."
 
"Do you mean, sir," Sarah asked, in a terrified tone, "for me to go up that staircase by myself? I could not do such a thing for the world. I could not, indeed, sir."
 
"We will reward you handsomely, Sarah," papa began.
 
"Don't ask me, Dr. Ashleigh. I could not do it if it were to make me a rich woman all my life. Please, sir, don't ask me."
 
The girl was so evidently terrified at the idea of going up the secret staircase, and she had already done so much for us, that we felt it would not be right to urge her further, and we looked at each other for a moment or two in silence. Then Polly said,—
 
"The proper persons to go are certainly Agnes and I. It is our property for which the search is made, and it is our place to make it. I think that the best plan will be for Sarah to get up some morning an hour earlier than usual. We will be waiting outside for her to open the doors; papa will be with us, and will stay there while we go inside, examine the room, and bring out the box in which the will is kept, if it is not too heavy for us to carry. What do you say, Agnes?"
 
I confess I was frightened at the idea, not of going up into the priest's chamber, but of entering the house in that sort of secret midnight way, and at the thought of the scene which would ensue if we were detected. However, Polly seemed so brave and confident about it, that I was ashamed to offer any opposition, and so said that I thought it would be a very good plan.
 
"I think so, too," papa said. "It certainly seems a strange expedition for us to make at five o'clock on a March morning; still, with such a fortune depending upon it, one does not mind doing strange things to obtain it. But before we do it, write to Sophy; tell her what has happened, and what you intend doing, and ask her to send you by return of post an authority from her to search in her name as well as your own for the will. It would be as well, in case of any misadventure, that we should be able to prove that we are acting in the joint interest of the heirs. Let me see; to-day is Friday. She cannot get the letter now till Monday, and you will have her answer on Tuesday. So let us say Wednesday, Sarah. What time is the house stirring?"
 
"At seven, sir, the servants get up."
 
"Very well; will you be at the front door as the clock strikes six? We shall be there. If not, some change will have taken place in our plans. And now, Sarah, whether we succeed in our aim or not, we are equally indebted to you. Here are twenty pounds for you, for what you have done for us; and if we get the will, you may rely upon it that you shall have a present which will make you comfortable for life."
 
Sarah retired delighted with her present, and promising to be ready on Wednesday. We then had a long chat over our plans. Papa, who had, I think, a strange tinge of romance in his disposition, quite looked forward to the adventure, and he and Polly talked it over with great glee. Papa said that he should write to Mr. Petersfield, tell him that we had found the chamber, and ask him to come down and be present at the finding of the will, so that he could—should the box be too large for us to carry—give us his advice as to the best course for us to pursue.
 
On Tuesday morning we received the answers to the two letters;—that from Sophy written in high spirits at our discovery, and authorizing us to act in her name; that from Mr. Petersfield, also written in terms of warm congratulation, and saying that, although the legality of our course was at least doubtful, he had felt so warm an interest in our search, that he would come down to be present at the dénouement, and he felt quite sure that the will, when found, would amply justify our proceedings. He said that he should leave town by the afternoon train. And so nothing whatever seemed likely to occur to postpone our expedition, as I could not help hoping in my heart that something would do.
 
Mr. Petersfield came down in the evening, and was full of spirits at the prospect of recovering the will, and made several jokes about female burglars, which amused Polly very much, but made me feel shivery and uncomfortable.
 
At night, after we had gone up to bed, Polly came into my room, and said,—
 
"Agnes, darling, I can see you are nervous and frightened about this expedition of ours. You are not strong, you know, and I think that really you ha............