Apertures: Book One — Darrell Bain

Twins Jan and Jani discover the existence of alternate Earths in a most unusual way. The first exploring party from another alternity immediately recognize that the twins have a powerful but unrealized talent for creating apertures into alternate worlds, but the twins suddenly realize they can spot an aperture and the person who formed it at a considerable distance, a talent they didn't know they had. The explorers from the Pankan Empire on another Earth have never seen the like of the twins. They are determined to not only subdue our Earth but to capture or kill the twins before they can develop their great ability to a point where they can help America and her allies resist the invasion. Within days, following one narrow escape after another, the Twins keep learning more and more about their abilities. They and their parents are helped by an old army buddy of Jan and Jani's father, Herb Friedman. To complicate matters, Friedman has a beautiful young daughter Jan is interested in. The