Firefly Lane by Kristin Hannah

When a glamorous girl moves across the street in 1974, she and her awkward neighbor forge a friendship that becomes the anchor of both their lives. Over three decades, these best friends navigate wildly different paths—one chasing fame and ambition across the globe, the other building a quiet life of family and home—through jealousy, envy, and the messy realities of growing up. A single act of betrayal threatens to shatter everything they've built together, forcing them to confront the painful truth about what they've sacrificed and what really matters. This is a gorgeous, emotional tribute to female friendship and the complicated ways we love and hurt the people who know us best.