The novella tells the story of an adventurous expedition to Kal-Jmar, a mysterious and ancient city located on a distant planet. The protagonist and their team must navigate various dangers and uncover secrets that challenge their understanding of the universe. Knight's writing is characterized by imaginative settings, intricate plots, and thoughtful exploration of speculative ideas.Themes in "Doorway to Kal-Jmar" likely include exploration, the clash between ancient and modern civilizations, and the quest for knowledge. The novella combines elements of adventure, mystery, and science fiction, providing readers with an engaging and thought-provoking narrative.