The main character is a young man known as Austin Gilroy. He studies physiology and knows a professor who is studying the occult. The young man is introduced to a middle-aged woman known as Miss Penclosa, who has a crippled leg and psychic powers. She is a friend of the Professor's wife. The skeptical Gilroy's fiancée, Agatha, is put into a trance to prove Miss Penclosa's powers. This succeeds and Gilroy begins to go to the Professor's house where Miss Penclosa practices her powers on him (one of the many things she tells him is that her powers vary with her strength). This is so Gilroy can look at the physical part of the powers.
An impressive story that grips the reader almost immediately, and only releases him/her in the final paragraph. Here, Doyle shows us a golden rule: when you have a solid and original plot, you just need a few characters to set the wheel spinning at a quick pace; furthermore, the book is plenty of events whereas the number of pages is not! I take my hat off to Sir Arthur. You will do likewise, I´m certain.
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