An impetuous Pinkerton agent is out to prove to a righteous US Marshal that she's the best "man" to complete the assignment and the only "woman" who can capture his heart.

Mae Simon is on her first assignment as a Pinkerton operative and determined nothing will stand in her way of accomplishing her task. When the simple assignment turns into a murder and kidnapping, she has to stop hiding behind her disguises and trust a man she's betrayed.

U. S. Marshal Beck Harlan can't afford to befriend anyone. Not with a vengeance seeking outlaw killing off his intimate acquaintances. Yet, he falls hard for the French prostitute he talks into being an informant, not realizing she is a Pinkerton operative after the same man.