'I was really shocked to see the change in Mabel. She was a mass of nerves, twitching all over, yet I had the greatest difficulty in making her tell me what the trouble was. I got at it, as one always does get at these things, indirectly. I asked her about some friends of hers she was always mentioning in her letters, the Gallaghers. She said, to my surprise, that she hardly ever saw them nowadays. Other friends whom I mentioned elicited the same remark. I spoke to her then of the folly of shutting herself up and brooding, and especially of the silliness of cutting herself adrift from her friends. Then she came bursting out with the truth.

'"It is not my doing, it is theirs. There is not a soul in the place who will speak to me now. When I go down the High Street they all get out of the way so that they shan't have to meet me or speak to me. I am like a kind of leper. It is awful, and I can't bear it any longer. I shall have to sell the house and go abroad. Yet why should I be driven away from a home like this? I have done nothing."

'I was more disturbed than I can tell you. I was knitting a comforter for old Mrs Hay at the time, and in my perturbation I dropped two stitches and never discovered it until long after.

'"My dear Mabel," I said, "you amaze me. But what is the cause of all this?"

'Even as a child Mabel was always difficult. I had the greatest difficulty in getting her to give me a straightforward answer to my question. She would only say vague things about wicked talk and idle people who had nothing better to do than gossip, and people who put ideas into other people's heads.

'"That is all quite clear to me," I said. "There is evidently some story being circulated about you. But what that story is you must know as well as anyone. And you are going to tell me."

'"It is so wicked," moaned Mabel.

'"Of course it is wicked," I said briskly. "There is nothing that you can tell me about people's minds that would astonish or surprise me. Now, Mabel, will you tell me in plain English what people are saying about you?"

'Then it all came out.

'It seemed that Geoffrey Denman's death, being quite sudden and unexpected, gave rise to various rumours. In fact - and in plain English as I had put it to her - people were saying that she had poisoned her husband.

'Now, as I expect you know, there is nothing more cruel than talk, and there is nothing more difficult to combat When people say things behind your back there is nothing you can refute or deny, and the rumours go on growing and growing, and no one can stop them. I was quite certain of one thing: Mabel was quite incapable of poisoning anyone. And I didn't see why life should be ruined for her and her home made unbearable just because in all probability she had been doing something silly and foolish.

'"There is no smoke without fire," I said. "Now, Mabel, you have got to tell me what started people off on this tack. There must have been something."

'Mabel was very incoherent, and declared there was nothing - nothing at all, except, of course, that Geoffrey's death had been very sudden. He had seemed quite well at supper that evening, and had taken violently ill in the night. The doctor had been sent for, but the poor man had died a few minutes after the doctor's arrival. Death had been thought to be the result of eating poisoned mushrooms.

'"Well," I said, "I suppose a sudden death of that kind might start tongues wagging, but surely not without some additional facts. Did you have a quarrel with Geoffrey or anything of that kind?"

'She admitted that she had had a quarrel with him on the preceding morning at breakfast time.

'"And the servants heard it, I suppose?" I asked.

'"They weren't in the room."

'"No, my dear," I said, "but they probably were fairly near the door outside."

'I knew the carrying power of Mabel's high-pitched hysterical voice only too well. Geoffrey Denman, too, was a man given to raising his voice loudly when angry.

'"What did you quarrel about?" I asked.

'"Oh, the usual things. It was always the same things over and over again. Some little thing would start us off, and then Geoffrey became impossible and said abominable things, and I told him what I thought of him."

'"There had been a lot of quarrelling, then?" I asked.

'"It wasn't my fault - "

'"My dear child," I said, "it doesn't matter whose fault it was. That is not what we are discussing. In a place like this everybody's private affairs are more or less public property. You and your husband were always quarrelling. You had a particularly bad quarrel one morning, and that night your husband died suddenly and mysteriously. Is that all, or is there anything else?"

'"I don't know what you mean by anything else," said Mabel sullenly.

'"Just what I say, my dear. If you have done anything silly, don't for Heaven's sake keep it back now. I only want to do what I can to help you."

'"Nothing and nobody can help me." said Mabel wildly, "except death."

'"Have a little more faith in Providence, dear," I said. "Now then, Mabel, I know perfectly well there is something else that you are keeping back."

'I always did know, even when she was a child, when she was not telling me the whole truth. It took a long time, but I got it out at last. She had gone down to the chemist's that morning and had bought some arsenic. She had had, of course, to sign the book for it. Naturally, the chemist had talked.

'"Who is your doctor?" I asked.

"'Dr Rawlinson."

'I knew him by sight. Mabel had pointed him out to me the other day. To put it in perfectly plain language he was what I would describe as an old dodderer. I have had too much experience of life to believe in the infallibility of doctors. Some of them are clever men and some of them are not, and half the time the best of them don't know what is the matter with you. I have no truck with doctors and their medicines myself.

'I thought things over, and then I put my bonnet on and went to call on Dr Rawlinson. He was just what I had thought him - a nice old man, kindly, vague, and so short-sighted as to be pitiful, slightly deaf, and, withal, touchy and sensitive to the last degree. He was on his high horse at once when I mentioned Geoffrey Denman's death, talked for a long time about various kinds of fungi, edible and otherwise. He had questioned the cook, and she had admitted that one or two of the mushrooms cooked had been "a little queer", but as the shop had sent them she thought they must be all right. The more she had thought about them since, the more she was convinced that their appearance was unusual.

'"She would be," I said. "They would start by being quite like mushrooms in appearance, and they would end by being orange with purple spots. There is nothing that class cannot remember if it tries."

'I gathered that Denman had been past speech when the doctor got to him. He was incapable of swallowing, and had died within a few minutes. The doctor seemed perfectly satisfied with the certificate he had given. But how much of that was obstinacy and how much of it was genuine belief I could not be sure.

'I went straight home and asked Mabel quite frankly why she had bought arsenic.

'"You must have had some idea in your mind," I pointed out.

'Mabel burst into tears. "I wanted to make away with myself," she moaned. "I was too unhappy. I thought I would end it all."

'"Have you the arsenic still?" I asked.

'"No, I threw it away."

'I sat there turning things over and over in my mind.

'"What happened when he was taken ill? Did he call you?"

'"No." She shook her head. "He rang the bell violently. He must have rung several times. At last Dorothy, the house-parlourmaid, heard it, and she waked the cook up, and they came down. When Dorothy saw him she was frightened. He was rambling and delirious. She left the cook with him and came rushing to me. I got up and went to him. Of course I saw at once he was dreadfully ill. Unfortunately Brewster, who looks after old Mr Denman, was away for the night, so there was no one who knew what to do. I sent Dorothy off for the doctor, and cook and I stayed with him, but after a few minutes I couldn't bear it any longer; it was too dreadful. I ran away back to my room and locked the door."