"The Speed of Darkness" is a science fiction novel by George Alec Effinger. It explores the concept of darkness as a physical entity that can move and interact with the world. The story follows a protagonist who navigates a future where technology and human experiences intertwine, raising questions about perception and reality. The narrative delves into themes of identity, consciousness, and the nature of existence. As the characters confront the implications of darkness, they grapple with their own fears and desires, ultimately leading to a deeper understanding of themselves and their surroundings.