Velvet Templeton is a secretary at the super-secret espionage agency, ARC-7, in London in the 1970s. Just a quiet, competent secretary, liked and trusted by her coworkers and the agents.
But Velvet has a past her fellow secretaries and most of the agents don't know, and when an agent is killed in circumstances implicating another agent as a double agent, she's not about to sit idle. She starts investigating on her own.
Velvet is a former agent herself, a highly skilled and dangerous agent, and her skills are still with her.
There's a reason she's not a field agent anymore; a reason she sits quietly behind a desk and very few know her professional past. And when she starts investigating the circumstances behind Agent X-14's death, she discovers that things she believed about that past were lies. That there's a bigger conspiracy than she suspected.
That she has no idea who she can or can't trust.