Inspired by the classic Led Zeppelin song, and the twelfth Justice Security story, Black Dog takes place very soon after the events of Hell's Bells. The story opens with Jessica Queen, Percival "King Louie" Washington, and Dexter Beck dealing with recurring nightmares. The dreams are so bad that all three consult with Dr. Caleb Mitchell, the Justice Security staff psychiatrist. Caleb discovers a common thread running through the dreams, and prescribes...