The time is 1893, the scene the Chicago World's Fair with its technical exhibits of a new century's marvels, electricity, the telephone and telegraph. Nearby a multi-turreted castle owned by G. Gordon Gregg (Pharmacist) is used as a hotel by fair tourists. No-one noticed anything unusual about the disappearance of some particularly beautiful guests ... no-one that is save Crystal whose curiosity and ambition led her step-by-step into Gregg's dark world of ghastly invention.