Recruits Series by Thomas Locke

For a decade now, seventeen-year-old twins Sean and Dillon Kirrell have been drawn to a mysterious alternate world they've translated into hand-drawn images covering their bedroom walls. It's a world they've only seen in their dreams until now--when a stranger recruits them to train for a mind-bending mission of survival.

When twins Sean and Dillon Kirrell use their transit abilities to rescue a kidnap victim, they cross a clandestine group within their government who seeks to control all planets with their transit powers, forcing the brothers to choose sides in what could explode into full-blown war.