England is torn in civil strife as the Royalists battle the Parliamentary Party for control. This conflict distracts people from rational thought and allows unscrupulous men to gain local power by exploiting village superstitions. One of these men is Matthew Hopkins, who tours the land offering his services as a persecutor of witches.

The great hypnotist Professor Montserrat has developed a technique for controlling the minds, and sharing the sensations, of his subjects. He and his wife Estelle test the technique on Mike Roscoe, and enjoy ‘being’ the younger man. But Estelle soon grows to love the power of controlling Roscoe, and the vicarious pleasures that provides. How far will she go, and can the Professor restrain her in time?