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.

The disappearance of her old friend Lila takes author Elena back to the early days of their friendship in 1950s Naples, when they were two very different girls, both top students in their class.

Elena and Lila struggle to continue their education; a death changes the community forever.

Now, Elena and Lila are teenagers, but their futures are so different that they struggle to connect.

Falling from the Edge: Elena enters high school, while Lila ignores her many suitors.

Elena grows tired of Gino, while Lila rejects two potential suitors at her cost; a rare outing in the city turns violent; after Elena accepts an invitation to spend the summer away from the community, worried about not being able to stay with Lila.

On the island of Ischia, Elena meets the Sarratore family by chance, rekindling her childhood fascination with Nino; Lila's resistance to Marcelo's urgent pursuit reaches the limit; an accidentThe encounter left Elena uneasy on her 15th birthday.

Still recovering from the breakup, Elena reunites with Antonio, who tells her the truth about Nino's betrayal.Later, Elena discovers that her new book is a success, and the atmosphere at Elisa and Marcelo's wedding becomes tense when Elena learns that the Solara family is ready to declare war on her for tainting their family.reputation.

After Elena discovers that Carmen is forced to sue her for libel, she and Lila decide to work together to expose the Solara brothers.Later, Elena learns that their article may not be enough to land the Solara brothers in jail.

Nino finally comes to visit Irma, but a mysterious disappearance suddenly occurs, shocking the entire community.Although the Solaras helped organize the search, Enzo remains suspicious of their involvement, while Lila becomes embroiled in her own conspiracy.Later, her son's drug habit and another sudden loss pushed Lila further into despair.

After learning that Pasquale and Nadia were arrested, Lila told Elena that Gennaro had escaped.Although Lila was not affected, when Elena learned that Elsa had also fled with him, she tried to control the crisis.Years later, Lila surprises her friends again.