Thibault Goes Missing ! This is Book Two of the Troglodyte Trilogy, which is set in the Loire region of France. This second book tells the story of a little French boy who goes missing, following a visit to the troglodyte school with his classmates from Saumur. Roodery, the heron, is called on by his troglodyte friend, Maud, to ask if he will join in the search. Again easy French words and phrases are included in the text with the English equivalent next to it, which creates a unique ambience.