"But why has one never heard of it?" I said.
"Well, of course, the mother kept it out of the papers. For a long time she feared they might have been the victims of the sort of person who preys on young girls, and dreaded that there should be a scandal by which their lives should be ruined if they ever returned. To-day I think she would be glad to find them even in the lowest brothel, if she might only see them again."
"Hadn't any of the police or detectives a theory?"
"Oh, thousands at first, but they never bore any fruit. Consider all the circumstances. They were sensible, self-reliant American girls. By this time, if they were alive, they would have found some means of communicating with their mother. She has published guarded appeals, which they would understand, and always in the English language, in about every paper in this country and Europe."
"But what do you think?"
"What can one think? Can you conceive of any solution when you consider all the facts?"
"Has the mother no theory?"
"Well, she has, but then she is hardly sensible, you know, after the strain of such an experience. You've heard of the Fourth Dimension, haven't you? She says if that's not the explanation, she cannot imagine any other. She doesn't really believe it, I think, but she says if they did not stumble into it, where are they? And what answer can one give her?"
By this time it was late, and I came away. Outside the sun was shining and the trolley cars buzzing by. The theory of the Fourth Dimension seemed absurd, but I wondered where those poor young girls could have gone, and felt an oppression in my breathing.