Next day about noon I walked up to see Mrs. Smith. The assistant, Evans, came to me, bringing me her apologies. Unless it were anything of the gravest importance, would I mind coming again?

"The fact is, she has been upset this morning," Evans went on. "A gentleman unexpectedly turned up to see the doctor about a new patient coming here. He had not heard of the doctor's tragic death, and Mrs. Smith had to explain."

"Very trying for her," I said.

"And, to make it worse, the man was rather stupid," said Evans. "He didn't seem to understand the position, nor why the doctor's death should prevent arrangements being made. He appeared to have got it into his head that we were unwilling to let him see how the house was conducted. I was called in to the rescue, and I took him over the house. If the weak-minded patient is a relative, I should think the disease is hereditary."

"Why?"

"He could not understand any explanation," said Evans. "He even selected a bedroom which happened to be mine, and would go into details why it was exactly the room he desired. Of course, the house is to be given up. I believe the relations of the three patients we have already have been written to."

"I wanted to ask Mrs. Smith if the doctor's papers throw any light upon his death."

"They do not. Mr. Ferguson was here nearly the whole of yesterday, and he told me there was nothing to suggest that the doctor was in difficulties, or that he contemplated taking his own life. His will was found. He leaves everything to his wife, but Mr. Ferguson said there was not much to leave beyond his life policy."

"That represents a large sum," I said.

"Does it? I'm glad for Mrs. Smith's sake. Mr. Ferguson didn't mention the amount. I wish it had been large enough for the doctor to think of leaving me a bit. At my age a man doesn't easily get another job."