Sometimes the best business ideas pop up when you least expect them. Or that's what happens to Wednesday Wilson, anyway, the morning her brother, Mister, locks himself in the bathroom because he's nervous about a school presentation. When classmate Emmet convinces Mister that a worry stone will calm his nerves, Wednesday offers Mister her marble -- with the promise that a Worry Marble will fix all his problems! But then Wednesday starts thinking about just how many things kids get nervous about. And, hmm, she does happen to have a whole collection of marbles. Has Wednesday just hit entrepreneurial gold?