The Multiverse — Karen Hutchins Pirnot

Scientists on parallel planets seek to discover the mysteries of the ancient Skymasters. While Allie and Eilla Henderson work with the science teams to determine how recent, groundbreaking information will affect humankind, an unexpected event occurs which will put everything into perspective. In this final Skymasters book, questions will be posed and answered. And finally, two preteeen time travelers take their places in history.