What is the author's style in The Great Divorce by C. S. Lewis?

The point of view in this novel is first person from the narrator's point of view. The narrator represents everyman, so the reader can take the journey through Hell and Heaven with the narrator. The narrator interacts with some of the ghosts, but many of the ghosts are simply observed by the narrator. In these instances, the point of view seems to switch to the third person until the narrator comes back in to ask his guide questions about what he has just witnessed or to make comments of his own.