Kristy's mother is getting married and she is going to be the maid of honor. Is this going to be the only surprise? The answer is no because 14 kids are coming to down for the wedding. Kristy and the rest of the Baby-Sitters Club think they can handle it all, but this turns out to be their toughest assignment. They will have to work extra hard to make sure that Kristy's big day is a complete success.