The "Passage Trilogy" is a series of novels written by author Justin Cronin. It consists of three books: The Passage, The Twelve, and The City of Mirrors. The story is set in a post-apocalyptic world where a viral outbreak transforms humans into vampire-like creatures, leading to the collapse of civilization. The narrative follows a group of survivors as they navigate this dangerous new reality. The trilogy explores themes of survival, humanity, and the consequences of scientific experimentation. It features a rich cast of characters, including Amy Harper Bellafonte, a young girl with a unique connection to the virus. The series has received critical acclaim for its gripping storytelling and complex character development.