From back of book: David Grant has a singular talent--he can affect the course of his dreams. Quite by chance, he discovers the existence of the Trans-Humanist Institute and their lucid dreaming lessons. He discovers that under the tutelage of Dr. Thotmoses he has more control over his dreams. However, his talent soon runs away with him and he visits dreamplaces while awake. The waking world and the dreaming world collide. Grant ends up sedated in a hellish mental institution...but escapes through his lucid dreams, which he is beginning to control.

Grant discovers, to his horror, the Dr. Thotmoses belongs to the Caucasus Synod Western Orthodox Church, and that they have been grooming him because of his fantastic dreaming talents. Only someone with his talent at manipulating reality and dreams can bring their prayer to the Divine Presence in the universe. Many have tried this journey, few have succeeded. Those who have returned successfully are rewarded beyond their wildest dreams.

(Source: Tor)