Who is Nicole James from Chasing the Dime: A Novel and what is their importance?

Nicole James is a former intelligence officer for Henry's company and Henry's former fiance. When their relationship ends, Nicole leaves her position with Amedeo with a generous severance package. Henry is still hurting. He can't believe he let things go so far, and he misses her, but she is trying to move on. When Henry realizes that he is being set up, and manages to narrow it down to someone who is close enough to him to know his secrets about Isabella, he thinks that Nikki is behind it.