In one impulsive moment the summer before they leave for college, overachievers Scarlett and David plunge into an irresistible swirl of romance, particle physics, and questionable decisions. Scarlett and David have known each other all their lives in small-town Graceville, Colorado, where David is just another mountain in the background, until, one day, he is suddenly so much more than part of the landscape. Magnetic, spontaneous, David is a gravitational force. And Scarlett, pragmatic, wry, eye on the future, welcomes the whirlwind he brings even as she resists it.