Thanks, Lisa. I’ve taken your suggestion and added a closing paragraph. I also rewrote the final scene and now Milly takes one of the biscotti from his plate and dunks it into his coffee before the leaves. Here’s my new final paragraph:
He rose and put on his coat. Milly and Tim—mostly Tim—held court across the dining room with about a dozen smiling students and faculty. She caught Mark’s glance as he reached the exit and held up the pilfered biscotti. He smiled, turned up his collar and stepped into the cold night, wondering if the campaign wasn’t the only thing heating up.