"Drowned Cities" is a young adult novel by Paolo Bacigalupi set in a future America ravaged by climate change and war. The story follows two main characters, Tool, a genetically engineered dog, and Mahlia, a girl who has survived the chaos of a flooded city. They navigate a dangerous landscape filled with warring factions and environmental devastation. The novel explores themes of survival, loyalty, and the impact of human actions on the environment. As the characters face moral dilemmas and the harsh realities of their world, they must decide what it means to be human in a society that has lost its way.