Dreamfire

A young dream walker must save the world from certain destruction one dream at a time, in this riveting debut from Kit Alloway, an exciting new talent in young adult fiction.
Unlike most 17-year-olds, Joshlyn Weaver has a sacred duty. She's the celebrated daughter of the dream walkers, a secret society whose members enter the Dream universe we all share and battle nightmares. If they fail, the emotional turmoil in the Dream could boil over and release nightmares into the World.
Despite Josh's reputation as a dream walking prodigy, she's haunted by her mistakes. A lapse in judgment and the death of someone she loved have shaken her confidence. Now she's been assigned an apprentice, a boy whose steady gaze sees right through her, and she's almost as afraid of getting close to him as she is of getting him killed.
But when strangers with impossible powers begin appearing in the Dream, it isn't just Will that Josh has to protect—it's the whole World.