It is 1889, and the entire world breathlessly anticipates the Paris World's Fair and the opening of Monsieur Eiffel's iconic tower. The Twelve Detectives—a society of the twelve most famous, compelling, and dazzling detectives from around the world—have been asked to discuss the secrets of their trade as part of the fair's lineup of events. The Twelve travel to Paris to convene as a single body for the first time, but also, if some whispers are to be believed, to debate the very philosophy that underlies their pursuit of the world's most wanted criminals.