Leona Hewitt, disguised in men’s formal evening clothes, has secretly made her way into Lord Delbridge’s private museum to recover a relic stolen from her family years ago. But someone else is there in the dimly lit gallery, on the same errand: a tall, black-cloaked man whose very voice is enough to put her in a trance. Thaddeus Ware, a mesmerist with powerful psychic energy, is accustomed to fearful reactions from others - women in particular. After all, a man who can control the minds and actions of others could rob a lady of her virtue - without her ever knowing! But Leona shows no trace of hysteria in his presence. A force to be reckoned with as both a gifted crystal worker and a woman, she exerts a rather hypnotic power over the hypnotist himself.