Uttara Kanda, the Later Book, opens by filling in Ravana's own extensive backstory before turning to a harsher continuation of Rama's reign: despite Sita's public fire ordeal at the war's end, rumors persist among Ayodhya's citizens doubting her purity after so long in Ravana's captivity, and Rama, prioritizing his subjects' confidence in their king above his own personal wishes, reluctantly banishes the now-pregnant Sita to the forest, where she is sheltered by the sage Valmiki himself and gives birth to twin sons, Lava and Kusha.
The boys grow up at Valmiki's hermitage learning to recite the very poem that narrates their own father's story, not realizing its subject is their own family, until a chance encounter at one of Rama's own sacrificial ceremonies reveals their identity; Rama, overjoyed, asks Sita to return and undergo yet another public trial to silence doubt permanently, and Sita, her patience finally exhausted, instead calls upon her mother, the earth goddess, to receive her back if her purity has always been true, and the earth opens and takes her in, ending her life on earth rather than submitting to further proof. The book closes, years later, with Rama himself, his earthly mission complete, walking into the Sarayu river and returning to his divine form as Vishnu.