Set in a dystopian future, the narrative depicts a world plunged into universal infertility, where the human race faces imminent extinction after decades without a single birth. The story follows Theo Faron, a disillusioned academic who reflects on a decaying society governed by his authoritarian cousin, Xan Lyppiatt, the Warden of England. Amidst the despair of the "Omega" generation and state-sanctioned suicides known as the Quietus, Theo is drawn into a dangerous resistance movement called the Five Fishes. His apathy is shattered when he discovers that a member of the group, Julian, is miraculously pregnant, making her the focus of a desperate struggle for the future. As they flee government forces, the small group faces violence and betrayal while seeking a safe place for the child to be born. Ultimately, the text explores themes of hope, power, and the endurance of humanity against a backdrop of total civilizational collapse.