Abby is a young woman shying away from close contact with others and running from a terrible event in her early teens which has shaped her life. Then she meets Daphne, the daughter of a pastoralist, who grew up in a remote valley of the Brindabella Ranges. Daphne raised her family in the high country with her husband Doug, in a world of horses, cattle and stockmen. But the government forced them off their land, and years later, Daphne is still trying to come to terms with her departure from the mountains and the tragic impact it had on her husband.

Though years and life experience separate Abby and Daphne, they understand each other, and a gentle friendship forms. While Abby's traumatic past hampers her involvement with journalist Cameron, Daphne tussles with her own family history and the shadow it may have cast over the original inhabitants of the land. Both women must help each other face the truth and release long-buried family secrets before they can be free.

The Grass Castle is a sweeping rural epic that reflects the strength which resides in us all: the courage to learn and grow from the past.