The Mystery in Paris is the 5th book in the Thea Stilton book series. The Italian version was first published on March 13, 2007, with the English version was released on November 1, 2010.
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When Colette invites her friends to come home with her to Paris for spring break, the five mice are delighted. While they're in France, they'll even get to attend Colette's fashion-designer cousin Julie's runway show at the Eiffel Tower! But soon after the Thea Sisters arrive, Julie's designs are stolen. Will the five mice be able to catch the thief in time to save the fashion show?