After writing several novels, I discovered that I like diversity. Always been an equal opportunity girl. First person narrative feels natural, feels right; but what it often lacks is the perspective from other characters. So, I dabbled in third person narrative mode in other books to get used to that writing style. Once I got the hang of it, I wondered why I couldn't bring this in to my first person books.
This site gives a basic rundown of what each one is: http://en.wikipedia.org/wiki/Narrative_mode
What I discovered when writing in the first person point of view, is that I want to know what's going on with other characters as much as the reader. That becomes difficult to do if you are married to first person. So I began incorporating third person POV in small increments. In Sterling, it is one lone scene with Adam. I wanted the reader to jump inside his head for a moment, and it was doable. It allowed the reader to gain some knowledge about Adam in small details that I did not want to bring in through conversation. More importantly, it established that this is something you will be seeing in the future.
I have found this to be extremely enjoyable. There will be more of it to come in the Mageri series and I think that it enhances the story. I do not do it in the same scene when my leading female is conscious or present. I don't like jumping back and forth. Typically, it's going to be a chapter unto itself, or seperated by * * *
You will know, and I absolutely do not do this going from paragraph to paragraph. My intent is not to confuse the reader, but to get them excited about a second storyline.
Otherwise, how will you know some of the juicy tidbits going on between sub characters? It's not heavy in the series, not at all. But it's enough that I think it brings more interest to that character and scene.
Remember those old movies where the leading character didn't know a bomb was about to go off - but the camera showed the villains finger underneath his desk touching a button? Yeah, I watched these types of shows and films. I liked knowing what else was going on that the main character didn't. I liked knowing what someone else was thinking or feeling. It added a little pepper to the soup. It adds spice.
So, I've incorporated that style into my 1st person POV books. I think you'll like it!
Enjoy your soup.