The lives of two inseparable friends, Tully and Julie, are irrevocably altered as they navigate the complexities of adulthood, love, and personal tragedy. Spanning several decades, the narrative follows the bond between the charismatic, impulsive Tully and the more reserved, observant Julie. As they move from their teenage years into womanhood, they face the pressures of societal expectations, shifting romantic loyalties, and the inevitable fractures that occur within long-term friendships. The story employs a character-driven framework to examine how individual choices and hidden secrets test the limits of their shared history.

This novel is frequently noted for its emotional intensity and the raw, often turbulent nature of its central friendship. Readers often highlight the author's ability to capture the nuances of a bond that is both sustaining and destructive over many years. The narrative style is characterized by a relentless pace that mirrors the volatility of the characters' lives. It remains a significant work in the genre of contemporary drama, often cited for its unflinching look at the complexities of female companionship.