"Thunderhead" is a young adult science fiction novel written by Neal Shusterman. It is the second book in the Arc of a Scythe series, following the events of the first book, Scythe. The story explores a future where humanity has conquered death, and a governing body known as the Thunderhead oversees society, ensuring peace and prosperity. In "Thunderhead," the narrative follows multiple characters, including Citra and Rowan, as they navigate the complexities of a world without mortality. The book delves into themes of morality, power, and the consequences of a utopian society, raising questions about the nature of life and death.