"The Hollow City" is a fantasy novel by Ransom Riggs, part of the Miss Peregrine's Peculiar Children series. The story follows a group of peculiar children who escape from a dangerous threat in their world. They journey to London, where they discover a hidden city filled with peculiar beings and face new challenges. The novel explores themes of friendship, bravery, and the importance of embracing one's uniqueness. As the characters navigate the Hollow City, they encounter various peculiar creatures and uncover secrets that could change their lives forever. The book combines vintage photographs with a captivating narrative, enhancing its magical atmosphere.