The novel follows Zoe Morgan, a woman deeply affected by the death of her younger sister during childhood. This tragedy leaves lasting emotional scars that shape her life and personality.
As an adult, Zoe becomes dedicated to helping abused and traumatized children and builds a stable life with her husband, Austin, and their daughter. However, after becoming a mother, her unresolved childhood trauma resurfaces.
Zoe gradually develops an obsessive fear of losing or harming her child, which begins to affect her mental health and puts strain on her marriage. Her growing anxiety threatens the stability of her family life.