Nineteenth-century London: Mary Graham is found murdered in a dark alley in Whitechapel. It appears that Jack the Ripper has returned. However, this London is a crime-free 'virtual city', a theme park re-created to attract tourists.

Roberta Morgenstern, a qualified witch, and her assistant Cl ment Martineau, fresh out of the police academy, set out to solve the murder. A wild chase through the streets of London brings the heroes face to face with the terrifying new Ripper.

Their mission is to find the man who is bringing these murderers back to life, as the trail of evidence leads them through a number of virtual eras and locations - Paris at the time of Louis XIV, Venice, and finally Montezuma's Mexico, where they have an assignation with the Devil himself ...