"French Puzzle Readers" is a bilingual series aimed at readers aged seven and upwards. The main narrative is bilingual throughout, and there is a French puzzle to solve on every double-page, for which all the French words and their translations are supplied. In addition, there is a comprehensive word list with simple pronunciation notes at the back of each book. "Le Chateau - The Castle" concentrates on the adventures of Sophie as she wends her way through a puzzle-packed castle on the trail of a hidden monster. Readers are encouraged to read the simple French in order to help Sophie solve the problems encountered on each page.