Kathie Dior & Lydie Guijarro: Les Portes Tordues (The Twisted Doors): The Scariest Way In The World To Learn French! (2003)
This is definitely the scariest way to learn French--and it's also the most fun! By focusing on the embedded mystery, you will learn an incredible amount of French in a very short time! Be sure to buy the companion book, LES PORTES TORDUES!
Recommended if you like
Professor Pierre Capretz.