Insurgent is the second book in the Divergent series by Veronica Roth, following the story of Tris Prior as she navigates a dystopian society divided into factions. As Tris grapples with the aftermath of a violent uprising, she must confront her own inner demons and make difficult choices that will determine the fate of her world. With heart-pounding action and complex characters, Insurgent delves deeper into themes of identity, loyalty, and sacrifice.