Mimi, Papa and two of their grandchildren - Christina and Grant - fly to Paris aboard Pap's red and white airplane, The Mystery Girl. As soon as they land at Charles de Gaulle Airport and meet their pen pals, Jean-Luc and Marie, the mystery begins. A famous statue is missing from the world famous Louvre Museum. A mysterious woman in black is following then. So is a pigeon --dropping clues and more along the way. To make things worse, the Eiffel Tower is in danger of falling!