Call Down the Hawk / Maggie Stiefvater (author).

The dreamers walk among us . . . and so do the dreamed. Those who dream cannot stop dreaming - they can only try to control it. Those who are dreamed cannot have their own lives - they will sleep forever if their dreamers die. And then there are those who are drawn to the dreamers. To use them. To trap them. To kill them before their dreams destroy us all. Ronan Lynch is a dreamer. He can pull both curiosities and catastrophes out of his dreams and into his compromised reality. Jordan Hennessy is a thief. The closer she comes to the dream object she is after, the more inextricably she becomes tied to it. Carmen Farooq-Lane is a hunter. Her brother was a dreamer . . . and a killer. She has seen what dreaming can do to a person. And she has seen the damage that dreamers can do. But that is nothing compared to the destruction that is about to be unleashed. . . .