And throughout my studies I have been pounded in the head with the notion that every great screenplay must have a hero who has a specific goal where there is strong opposition to that goal leading to a crisis and an emotionally satisfying ending. Now call me crazy but I have seen a ton of excellent movies that do not comply with this standard. Before I dive in to the specifics of Nicole's question, a little professional background. Log lines are not literary criticism. Nor are they movie reviews.
Log lines are tools for the development process.
A log line translates 120 pages of action into one simple idea. This is so that a busy development executive will have a reasonably accurate reference point for each script. Then her assistant reads the log line, which triggers a cascade of memories in the executive's head. But she's a professional, and given the reminder of the log line, she remembers. I know that one.