Daniel X: Demons and Druids is book 3 in the Daniel X sequence. Six science-fiction novels follow Daniel X as he hunts dangerous alien criminals. Start with The Dangerous Days of Daniel X. It follows Daniel X: Watch the Skies and should be read after that volume. Readers new to the series should begin with The Dangerous Days of Daniel X and follow the numbered publication order, which preserves the characters’ continuing development and the story’s intended progression.