A night of too much whiskey, a wrongly-numbered hotel door, and an angry guardian force dedicated cavalry captain Chase Brooks into marriage, despite his vow never to endure another loveless marriage. He reluctantly agrees to take his new wife with him to his remote outpost, convinced the pampered girl won't last two weeks in the harsh conditions of the southwest and will beg to be sent back east. The one thing he didn't count on was a burning desire for his unwanted wife. Callie Grant embraces the opportunity to start a new life far from the controlling hands of her guardians. Enduring the rough environment of the Indian Territories, she transforms from a timid flower into the poised, self-reliant woman she's always dreamed of becoming. As her gratitude towards the captain turns to love, she resolves to break through her husband's formidable reserve and uncover the passionate, loving nature he tries to hide.

Pinkerton Agent Jamie Donovan is packed with Irish Charm, from his disarming lilt to his devastating smile, and he knows it. He uses his gifts to bring evil to justice and women to his bed. Most women that is, except icy Kathryn Mitchell, Katie as he prefers to call her, much to her dislike. She seems immune to his charms, yet he finds himself drawn to her, feeling the need to protect the head-strong agent from herself. Kathryn Mitchell is determined to prove herself a capable investigator. With her three month trial employment nearly over, all seems to be going well, until rival agent Jamie Donovan shows up trailing the same thief she's been assigned to capture. When the thief they are pursuing turns up dead, Kathryn and Jamie travel from New York City to Boston, battling turf, armed felons, and their feelings for each other as they attempt to track down a murderer.