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For is latest invention, physicist Mason Brooks needs financial backing. To this end, he invites his wealthy sister Vera and her fianc , Dr Douglas Ashfield, to witness a demonstration. There is an explosion and the experiment goes horribly wrong, and Vera is not only blind but has lost her eyes entirely. Then, to restore her sight, Vera undergoes a dangerous surgical experiment which results in plunging all three of them into an astonishing web of mystery and intrigue...