It's a world they've seen only in their dreams--until now.

Twins Sean and Dillon Kirrel have dreamed about a world beyond their own since they were children, but it has always been a fantasy. Not long before their eighteenth birthday, however, the arrival of a mysterious new neighbour and the revelations he shares bring that far-off world within reach.

When Sean and Dillon learn they share a unique gift--the ability to transfer instantly between worlds--they are offered an opportunity to prove themselves as recruits to the planetary Assembly. But unlocking their abilities awakens an enemy beyond anything they ever imagined, thrusting them into an interplanetary conflict that could consume the entire human race.