I have said that Sir Thomas Rossiter wore a large hat drawn down over his brows. As he entered the hall he uncovered himself, and I was at once aware of a singular characteristic which the hat had concealed. His forehead, which was naturally high, and higher still on account of receding hair, was in a continual state of movement. Some nervous weakness kept the muscles in a constant spasm, which sometimes produced a mere twitching and sometimes a curious rotary movement unlike anything which I had ever seen before. It was strikingly visible as he turned towards us after entering the study, and seemed the more singular from the contrast with the hard, steady grey eyes which looked out from underneath those palpitating brows.
“I am sorry,” said he, “that Lady Rossiter is not here to help me to welcome you. By the way, Charles, did Evelyn say anything about the date of her return?”
“She wished to stay in town for a few more days,” said Lord Linchmere. “You know how ladies’ social duties accumulate if they have been for some time in the country. My sister has many old friends in London at present.”
“Well, she is her own mistress, and I should not wish to alter her plans, but I shall be glad when I see her again. It is very lonely here without her company.”
“I was afraid that you might find it so, and that was partly why I ran down. My young friend, Dr. Hamilton, is so much interested in the subject which you have made your own, that I thought you would not mind his accompanying me.”
“I lead a retired life, Dr. Hamilton, and my aversion to strangers grows upon me,” said our host. “I have sometimes thought that my nerves are not so good as they were. My travels in search of beetles in my younger days took me into many malarious and unhealthy places. But a brother coleopterist like yourself is always a welcome guest, and I shall be delighted if you will look over my collection, which I think that I may without exaggeration describe as the best in Europe.”
And so no doubt it was. He had a huge oaken cabinet arranged in shallow drawers, and here, neatly ticketed and classified, were beetles from every corner of the earth, black, brown, blue, green, and mottled. Every now and then as he swept his hand over the lines and lines of impaled insects he would catch up some rare specimen, and, handling it with as much delicacy and reverence as if it were a precious relic, he would hold forth upon its peculiarities and the circumstances under which it came into his possession. It was evidently an unusual thing for him to meet with a sympathetic listener, and he talked and talked until the spring evening had deepened into night, and the gong announced that it was time to dress for dinner. All the time Lord Linchmere said nothing, but he stood at his brother-in-law’s elbow, and I caught him continually shooting curious little, questioning glances into his face. And his own features expressed some strong emotion, apprehension, sympathy, expectation: I seemed to read them all. I was sure that Lord Linchmere was fearing something and awaiting something, but what that something might be I could not imagine.
The evening passed quietly but pleasantly, and I should have been entirely at my ease if it had not been for that continual sense of tension upon the part of Lord Linchmere. As to our host, I found that he improved upon acquaintance. He spoke constantly with affection of his absent wife, and also of his little son, who had recently been sent to school. The house, he said, was not the same without them. If it were not for his scientific studies, he did not know how he could get through the days. After dinner we smoked for some time in the billiard-room, and finally went early to bed.
And then it was that, for the first time, the suspicion that Lord Linchmere was a lunatic crossed my mind. He followed me into my bedroom, when our host had retired.
“Doctor,” said he, speaking in a low, hurried voice, “you must come with me. You must spend the night in my bedroom.”