For is latest invention, physicist Mason Brooks needs financial backing. To this end, he invites his wealthy sister Vera and her fiancé, 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...