Grand opening! Welcome to Fancy Nancy's Fabulous Fashion Boutique! Here you can find the fanciest almost-new outfits, accessories, jewelry, and lots more. There's even a necklace with real rhinestones for sale. Ooh la la! The fashion boutique is a huge success, but it's also Nancy's little sister's birthday. And when it starts to rain, her birthday party might be ruined! Nancy knows she has to come up with an idea—a brilliant one—and fast. In this trÈs chic story from bestselling duo Jane O'Connor and Robin Preiss Glasser, Nancy shows once again that sometimes all you need is a little improvising to turn a fiasco into something fancy.