Dr. Raymond's ultimate goal is to devise a way to open the mind of man so that he may experience all the world has to offer. He calls this, "seeing the great god Pan." After much study of the human mind he devises an experiment which involves minor brain surgery. He performs this experiment on a young woman named Mary, but when she awakes she is terrified and mentally crippled. Years later, the beautiful but sinister-looking Helen Vaughan is reported to have caused a series of mysterious happenings in a small nameless town. She spends all her days in the woods, scares a boy so much he is hospitalized, and leads to the rape of her best friend Rachel. Helen then moves to the London social scene and marries a man named Herbert. Years later Herbert is found by his former friend Villiers to be a beggar and vagrant. When asked how he has fallen so low, Herbert replies that he has been "corrupted body and soul" by his wife. Helen disappears for some time, supposedly taking part in disturbing orgies somewhere in the Americas. When she returns as Mrs. Beaumont she is followed by a series of suicides. Villiers discovers that she is in fact Helen and goes to confront her. He persuades her to hang herself and she has a very abnormal death, transforming between human and beast before finally dying. Ultimately, it is discovered that Helen is the child of Mary and Pan, who was let in when Raymond opened her mind up to him.