Rye Mallett, a fearless "freight dog" pilot charged with flying cargo to far-flung locations, is often rough-spoken and all business, but soft on regulations when they get in the way of meeting a deadline. But he does have a rock-solid reputation: he will fly in the foulest weather, day or night, and deliver the goods safely to their destination. So when Rye is asked to fly into a completely fogbound northern Georgia town and deliver a mysterious black box to a Dr. Lambert, he doesn't ask questions.

As Rye's plane nears the isolated landing strip, more trouble than inclement weather awaits him. He is greeted first by a sabotage attempt on his plane that causes him to crash land, and then by Dr. Brynn O'Neal, who claims she was sent for the box in Dr. Lambert's stead. Despite Rye's "no-involvement" policy when it comes to other people's problems, he finds himself irresistibly drawn to the intrigue surrounding his cargo . . . and to the mysterious and alluring Brynn.

Soon Rye and Brynn are in a treacherous forty-eight-hour race to deliver the box before time runs out. With everyone from law enforcement officials to hired thugs hot on their heels, they must learn to trust each other so they can protect their valuable cargo from those who would kill for it.