"The Passage" is a novel by Justin Cronin that combines elements of horror, science fiction, and adventure. The story begins with a government experiment aimed at creating a race of superhumans through a virus derived from bats. However, the experiment goes awry, leading to the outbreak of a deadly infection that transforms humans into vampire-like creatures. The narrative spans multiple timelines, focusing on the aftermath of the outbreak and its impact on humanity. A small group of survivors, including a young girl named Amy Harper Bellafonte, becomes central to the fight against the infected and the struggle for survival in a post-apocalyptic world.