Mrs. Allen appeared in less than a quarter of an hour. He received her in the living room and introduced himself, apologizing for not having been able to call on her. She understood perfectly, she said.

She was a woman about forty years of age, her face a little thin and worn, a good deal of gray in her dark hair. She had been nursing her husband for two years, and the strain had begun to tell. Nevertheless, he soon saw that she was a woman of refinement, possessed of a keen intelligence.

"I wish," he requested, after he had explained his connection with the murder, "you'd tell me all you know about these sisters. I gathered this morning that you were well acquainted with them."

He had always found it easy to gain the confidence of women. They liked his manners, his air of deference, his manifest interest in everything they said.

"I can't say that I've been intimate with them," Mrs. Allen explained in her soft, pleasing voice; "but Mrs. Withers and I knew each other pretty well. She came over to my house quite frequently, and I was in the habit of running in to see her."

"Don't you know the other, Miss Fulton, equally well?"

"No. You see, she was always in, or on, the bed, and she never seemed to want to talk. Besides, she was different from Mrs. Withers—not so bright and attractive, and not so neighbourly."

"Mrs. Withers was always a laughing, sparkling sort of a person, wasn't she?"

"She gave that impression to some people," Mrs. Allen answered thoughtfully, "but not to me. It was her nature to be free and happy. Most of the time she seemed that way. But there were other times when I could see that she had something weighing on her mind, something depressing her."

"Ah!" Bristow said with deeper interest. "That's just what we want to find out about."