Deenie is an attractive seventh-grader whose mother, determined that her good looks not be wasted, is pushing her toward modeling. When she tries out for the cheerleading team, however, Deenie's gym teacher notices her slightly crooked posture and refers her to an orthopedist who diagnoses adolescent idiopathic scoliosis. Both Deenie and her mother are horrified. Deenie decides an operation to "fix it" is the lesser of two evils when the alternative is to wear a brace for four years, but the doctor assures her the brace is the appropriate treatment.

Wearing the brace, initially merely a source of embarrassment, frustration, and anger, gradually makes Deenie aware of other kids with whom she has avoided contact because of various "handicaps." Her relationships within the family and among friends shift because of this new self-awareness and of others' varied capacities to accommodate to her new limitations.

The most gratifying discovery for her is that the boy with whom she has been developing a first romance does not find the brace a barrier either to friendship or to the tentative intimacies of early love. The subtheme of developing sexuality complements the novel's focus on body image as a crucial aspect of adolescent psychology.