The novel explores how deeply buried secrets can have a lasting impact across generations. The presumed suicide of Riley's sister, Lisa, has cast a long shadow over their family. As Riley digs deeper, she realizes that her parents harbored a significant secret about Lisa's disappearance, a secret that has shaped not only Riley's life but also their family dynamics for decades.

With the revelation that her sister is alive, Riley is forced to confront her own identity. Having grown up believing she had lost her sister, she now grapples with the reality of Lisa's existence and the choices she made. The novel examines how our past and family history shape our sense of self, and how uncovering hidden truths can lead to a journey of self-discovery and acceptance.

As Riley uncovers the truth behind Lisa's disappearance, she must confront difficult emotions and make sense of the past. The novel delves into the complexities of forgiveness, not just for others but also for oneself. It explores the possibility of reconciliation after years of separation and pain, questioning whether healing old wounds and rebuilding trust is possible.