Traumatized by a fall off a Manhattan high-rise, Deputy Marshal Laura Killen hasn't left her brownstone home in nine months. A former ace mountain climber, now she can't even face the two flights of stairs leading down from her apartment.

John MacLean doesn't care about her fear. Confronting her at gunpoint, he demands that she help him protect his nephew Ryan from the mobster who killed Ryan's parents. Learning that John may be the real killer, Laura finds the courage to go with him for Ryan's sake.
But snipers in an unmarked helicopter, murderous thugs on a train and leaks from someone at her headquarters convince Laura that John is no threat to Ryan. He is, however, a threat to her reawakening heart. As danger forces them to rely on each other, trust—and something more—begins to develop.

Pursued by killers, they finally reach Ryan's hideaway at a mountain lodge in Wyoming's Teton Wilderness. There Laura must face her fear of heights to save the man and child she loves.