Avery, Ella, and Sadie visit Paris and stay at the elegant Hotel Le Meurice with their grandmother, Mimi, and grandfather, Papa. Why do the girls NOT want to go the Louvre? Not even the Eiffel Tower? Not even (aghast) to ride the Tuileries carousel… or go shopping?! Because they have a new passion – mustaches, of all things!

Not only do they create them, they actually wear them… as well as tease, taunt, and (dare I say it?) SHOCK the staff with their upper lip antics! Where do all these mustache shenanigans lead? Mais oui! You just won’t believe it!