Johnny and the Bomb is the second novel in Terry Pratchett's young adult Johnny Maxwell trilogy. Johnny and his friends discover a bag lady and her shopping cart, which turns out to be a time machine. The boys accidentally travel back to World War II, specifically to the night of a major bombing raid in their town. The plot deals with the moral implications of time travel and interfering with history, as Johnny tries to save people he knows from the past. The book is a thoughtful blend of comedy, history, and moral philosophy.
