"The Cliffs" explores how the past reverberates into the present, shaping the lives of its characters. Jane's research reveals a legacy of stolen indigenous artifacts, reminding readers of the lasting impact of colonialism. This intertwines with the personal histories of the women who called the house home – their loves, losses, and secrets echoing through time to influence both Jane and Genevieve in the present day.

The imposing yet alluring presence of the house on the cliffs serves as a powerful symbol throughout the novel. For Jane, it represents a refuge from a turbulent childhood and later, a place to heal from a personal tragedy. Conversely, Genevieve's attempts to erase the house's past by renovating it reflect her own desire to escape a painful history. Ultimately, the house acts as a catalyst for both women to confront their pasts and find a path toward healing.

The novel delves into the complex relationships between women across different generations. From the whispers of past residents to the dynamic between Jane and Genevieve, Sullivan highlights the strength and resilience of women supporting and challenging each other. Through their shared connection to the house, Jane and Genevieve find common ground, forging an unexpected bond that transcends their differences.