Seventh-grader Abby Lovitt grows up on her family's California horse ranch in the 1960s, learning to train the horses her father sells and trying to reconcile her strict religious upbringing with her own ideas about life.

In the summer of 1980 before she starts junior high school in Santa Rosa, California, Tracy, who was adopted from Vietnam when she was six years old, finds an old ammo box with a dog tag and picture that bring up painful memories for both her Vietnam-veteran father and her.

Soon after her yearling, Jack, begins working with professional trainers at a nearby ranch, Abby Lovitt takes responsibility for a very large, very smart, and very curious retired racehorse named Gee Whiz.

"San Francisco in the 1970s. Free love has given way to radical feminism, psychedelic ecstasy to hard-edged gloom. The Zodiac Killer stalks the streets. A disgraced professor takes an office in a downtown tower to plot his return. But the walls are thin and he's distracted by voices from next door--his neighbor is a psychologist, and one of her patients dislikes the hum of the white-noise machine. And so he begins to hear about the patient's troubles...