The Single Eye (The Seeker #1)
When Stan Sigurdson, twelve years old, learns of a boarding school annex monastery where they teach you How to Talk with God, he figures, Why not? and decides to enroll. Once there, he discovers the school harbors a great mystery. And before he is well aware of it, he gets on the trail of an ancient Christian secret - one that goes back all the way to the Anointed One Himself.