Just beneath the streets of modern-day Los Angeles lies a world of demons ... and angels. Globetrotting misfit and renegade occultist John Constantine (Keanu Reeves), a man who has literally been to hell and back, enters this world to help a skeptical policewoman investigate the mysterious suicide of her twin sister in Constantine. Based on the long-running, adult DC Comics/Vertigo comic book series "John Constantine: Hellblazer."