Joanne Timbro and Darla Stevens have grown up in a small Texas town, their childhood homes separated only by adjoining back yards. Although the families inside these houses have little in common, the two girls find in each other a rare friendship that will take them into their adult lives; a friendship that makes them stronger together than either could be alone. Then as young women, Darla and Jo enter into an agreement that will startle everyone who cares for them. After years of watching Darla’s heartbreaking failure to have a baby with her husband, Cal, Joanne agrees to give birth to the child that Darla cannot have on her own. But in the early morning hours of a warm July morning, everything changes. Joanne, then four months pregnant, is driving a car that veers off the road near the home that Darla shares with Cal. In the days and months that follow, Darla must face for the first time in her memory, the possibility of life without Jo. As Darla tries to uncover the secrets that brought her friend out onto the highway in those dark morning hours, she discovers that she must also fight to keep the baby that was intended to be her child. With the child’s fate hanging in the balance, Darla searches for clues to Jo’s strange behavior leading up to the crash. In the process, she discovers truths that hide in her own life: in her marriage, in her closest friendships, and in a past that has suddenly reemerged, full of unfolding secrets.