Based on the DC / Vertigo comic book Hellblazer, Constantine tells the story of irreverent supernatural detective John Constantine (Keanu Reeves), who has literally been to hell and back. When Constantine teams up with skeptical policewoman Angela Dodson (Rachel Weisz) to solve the mysterious suicide of her twin sister (also played by Weisz), their investigation takes them through the world of demons and angels that exists just beneath the landscape of contemporary Los Angeles.