Meet Providence Traveler. Providence likes to make things. Not just ordinary things like macaroni pictures, but things that have never been made before. So it is not surprising that her hero is Leonardo da Vinci, the great sixteenth-century artist and inventor. One day at the library, when Providence is taking out her favorite book, "Leonardo da Vinci: Boy Was He Busy," she finds a scrap of paper covered with interesting designs for what looks like a mechanical mouse with a key coming out of its back. Diligently she follows the instructions on the paper and builds the intricate mouse. Just as she is putting on the finishing touches, in barge her brother and the meddlesome McMuzzin twins, who turn the key in the mouse's back. Suddenly there is a sound like thunder and a flash of light.
