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 instantly from place to place. Transitors who are also twins are especially rare, and so they are offered an opportunity to prove themselves as...

Twins Sean and Dillon are using their transit abilities for good--but not everyone sees it that way. Arrested and imprisoned by a clandestine group within the highest reaches of the Human Assembly, Sean and Dillon are forced to choose sides between those who wish to serve and those who seek to rule.

At the same time within a distant outpost system, a young soldier is coming into his own. Logan has known since childhood that he possessed a special ability--a distinct form of transiting called ghost-walking. Though ghost-walking has been outlawed for centuries, Logan is secretly drawing...