: Lou has a seemingly perfect life with a great job, a 13-year-old daughter, and a promising new relationship with a man named Scott. Donna, her friend since their teens, is described as needy, destructive, and increasingly envious of Lou’s stability.

: Donna begins to obsessively mimic Lou, encroaching on her personal life and uninvitedly inserting herself into family gatherings.

: A central theme is Donna’s desperate desire to "be" Lou, leading to dangerous imitations and boundary-crossing.

: The story explores why Lou remains loyal despite Donna’s behavior, rooted in a childhood debt where Donna defended her from bullies.

: The novel is known for a major mid-point "jaw-on-the-floor" shocker where a primary character is killed off, shifting the narrative perspective to other characters for the second half. Key Themes for Analysis