@DragonflyDreams,
Maybe the newcomer could be the narrator. The story, of course, wouldn't just focus on him. In fact, the story could focus on other people. That's how Great Gatsby is. While the narrator would relate his own exploits in the first person, he could still describe interactions among other people in the third person.
Dialogue is a way to include a lot of people without having direct access to all their thoughts.