"The Darkest Road" is the third book in the Fionavar Tapestry trilogy by author Guy Gavriel Kay. It continues the epic fantasy story that began in the previous novels, focusing on the struggle against the dark forces threatening the world of Fionavar. The narrative follows several key characters, including Kimberly, Dave, and Leah, as they confront their destinies and the challenges posed by the antagonist, the Dark. Themes of sacrifice, friendship, and the battle between light and darkness are central to the plot, culminating in a dramatic conclusion that ties together the trilogy's overarching story.