The fourth season is adapted from the last part of the Neapolitan tetralogy - The Missing Child -.Focusing on Lila and “I” (Lenon) in their prime and old age.Taking the loss of Lila's daughter Tina as the main thread, Lenon and Lila have always relied on each other and comforted each other. In most of their lives, they have never really left each other's world.The novel shows the deep and complex friendship between women, their resistance to the injustice under the oppression of male-dominated society, and their spiritual awakening.

“I” (Lenon) left her husband and returned to Naples with her two daughters for the sake of love and writing. Inevitably, I became close again to Lila and the city I had wanted to escape from.“I” (Lenon) and Lila even became pregnant and gave birth to a child in the same year, and experienced the great earthquake in Naples that destroyed everything. Everything fell apart and everything will be rebuilt again.

“I” (Lenon) was unknowingly involved in Lila's secret attempt to use my reputation and writing skills to fight against the city's stale and rampant evil forces.But after experiencing the most horrific blow in her life, Lila chose to completely exile herself in the city in a weird and exaggerated way.

And “I” (Lenon) will also face the failures of his writing, love, and family with amazing resilience and honesty.After years of self-doubt, “I” (Lenon) decided to write about his lifelong friendship with Lila.