Upon returning from a trade show, Joe King, a salesman, stops for a cup of coffee at a kiosk in the airport. To his consternation, an attractive young woman, whom he's never met before, gives him a big hug and a warm kiss. Realizing her mistake, she apologizes and hurries off—but not before he gets her name, Letty Farrell. Unable to get her out of his mind, he spends hours, searching the internet for information about her. All in vain.By chance, he runs into her at an arts and crafts shop on Cape Cod. When he asks her out for dinner, she, reluctantly, accepts. Enjoying each other's company, they begin going out together. She, however, refuses to tell him anything about herself and warns him that they can never be anything more than friends. Because he's fallen in love with her, he accepts the limits she has placed on their relationship.Only after a visit by an FBI agent, an encounter with one of her college friends, and the publication of her photo in a newspaper, does he learn the true identity of this mysterious, beautiful young woman.