One night several years ago Logan Crane and Harper Gallagher shared a night of passion and then walked away from each other. Neither one of them were in a position to offer anything other than heartbreak and disappointment.
Harper is a former intelligence officer in the navy, and now works for the CIA.  She is sent on an undercover mission to retrieve an apparatus that lists all the secret operatives working in the American intelligence community.

Logan had a bad experience working with the FBI that he never truly recovered from. Still he continues to do his duty working to protect the country he loves. He too is sent to apprehend the information that could land a devastating blow to his colleagues.
When the two of each other meet again they discover that some nights aren't easily forgotten, and maybe if they work together they can do more than protect state secrets, but also accept a love worth risking it all for