there must be a cause somewhere, I have come to the conclusion that it must be something mental.

“She complains of difficulty breathing satisfactorily at times, and of heavy, lethargic sleep, with dreams that frighten her, but regarding which she can remember nothing. She says that as a child, she used to walk in her sleep, and that when in Whitby the habit came back, and that once she walked out in the night and went to East Cliff, where Miss Murray found her. But she assures me that of late the habit has not returned.

“I am in doubt, and so have done the best thing I know of. I have written to my old friend and master, Professor Van Helsing, of Amsterdam, who knows as much about obscure diseases as any one in the world. I have asked him to come over, and as you told me that