"Her Fearful Symmetry" is a novel by Audrey Niffenegger that explores themes of love, loss, and the complexities of life and death. The story revolves around identical twins Elspeth and Edie, who share a deep bond but face challenges when they inherit a London apartment from their deceased aunt. As the twins navigate their new lives, they encounter ghosts and the mysteries of the past, leading to unexpected revelations. The narrative intertwines the lives of the living and the dead, highlighting the emotional connections that transcend physical boundaries and the impact of choices made in life.