Diana Gleason is determined to prove herself as a capable, confident, and essential Pinkerton agent, now that the agency had decided to bring women into their ranks. She'll do anything to accomplish her assignment, even if it means marrying her partner and training agent. Wyatt McGrath is a handsome, charming, experienced agent, filled with Texas politeness and the patience to teach Diana what she needs to know. But the more they get involved in the undercover investigation assigned to them, the more she discovers that her partner has secrets, and those secrets haunt him. More than that, those secrets could get in the way of their mission, and put them in danger. With growing feelings for Wyatt, and something to prove, Diana must decide if the mission comes before her partner, or if there is any way to save both.