Two months after moving to Pittsburgh, twenty-four-year-old Sarah Callumn has successfully turned her life upside down-and her sleep schedule with it. Working while the city sleeps suits her just fine. The silence helps. The empty streets help. And so does the fact that nobody expects conversation at six in the morning. Then she meets the man who lives one floor below. Dr. Jack Abbot is forty-six, sharp-tongued, quietly observant, and far too accustomed to spending his nights keeping people alive. He's also a widower who never expected to want this again. The twenty-two years between them aren't the problem. The fact that neither of them was looking for something worth staying awake for might be.