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.