Who doesn't love a World's Fair? Well, some murdering psychopath doesn't.
Simon and Elizabeth time travel back to 1900 Paris, a time when Toulouse-Lautrec sips cognac at a corner table at the Moulin Rouge, electricity is a new-fangled invention, and someone is hellbent on sabotaging the Paris Exposition.
Immersed in a world of Bohemian artists, absinthe, and political strife, Simon and Elizabeth must find out who is behind the sabotage and stop them before they set off World War One a few years early.
It's a romantic and dangerous puzzle only the Crosses can solve.