Joanna Bach and her brother, Jeremy, discover that there is more to their old violin teacher, Mr. Kepler, than meets the eye, when they discover a Kepler family heirloom that leads them into another dimension. Together with a growing assortment of neighbors and friends, they learn the truth about the old myth of a music of the spheres, and they save a tree. That's right, just a tree. Not the whole world. But you have to start somewhere!