Throughout the series, each sister grapples with the weight of their unknown past. 'Atlas' delves deep into the ramifications of Pa Salt's carefully guarded secrets, exploring the impact on his life and the complex web he weaved around his daughters' origins. The novel examines the choices made in the name of love, loss, and protection, and the bittersweet consequences they leave behind.

Driven by the fragments of their past revealed in Pa Salt's letters, each sister embarks on a personal quest for identity. Their journeys, both literal and metaphorical, take them across continents and deep within themselves. 'Atlas' illuminates the transformative power of confronting the past and embracing one's true self, even when met with unexpected truths.

Despite the pain and confusion caused by Pa Salt's actions, 'Atlas' ultimately celebrates the enduring bonds of family. The sisters, united by their shared history and love for their father, must learn to forgive his flaws and embrace the unconventional family they've created. The novel emphasizes that love and understanding can triumph even in the face of profound challenges.