For more than a decade, twins Sean and Dillon Kirrel have felt pulled toward another world--a place they have sketched out in detail and posted on the walls of their bedroom. They are certain it is out there. Soon after their seventeenth birthday, they are approached by a clandestine scout. To him, Earth is just a distant and unmonitored outpost of human civilization. But he explains that Sean and Dillon share a unique gift--the ability to transfer...