The first book in The Circle Series, Black, by Ted Dekker, details the dual reality of Thomas Hunter through his dreams. I appreciate the Christian symbolism created by Dekker, but don’t especially like the plot, which requires the reader to suspend disbelief. The story is a fantasy thriller about a man who leaves one world during his dreams and does the same in the alternative world. To keep it interesting, there is a deadly virus in the hands of evil people who want to master this world (or is it another world?). Only Hunter can stop them, but to accomplish that, he must travel between worlds. Then we have “The Birth of Evil,” which is cleverly woven into the story as an allegory for original sin.
The end of the book is less than satisfying, with the story left to continue in the next book of the Circle Series.