I recently read The Invention of Wings: A Novel by Sue Monk Kidd (2015).
In this book, SMK weaves a dual life-tale of two females, Sarah and Handful, who share the same last name (Grimke) and are raised in the same 1800s Charleston, South Carolina, household. The twist is that Sarah is born to the slave owing aristocracy and Handful is born one of their slaves. The two share a bond of friendship through their lifetimes.
From childhood through adulthood both women struggle mightily to break the cultural, social, spiritual, and physical chains that tether them to the accepted norms they find reprehensible.
SMK, in lovely prose, wove a story that not only pulls the reader in, but pulls us toward betterness. Excellent!