ConstantineSave

We open in Los Angeles. John Constantine (Keanu Reeves) — a demon-hunter, exorcist, and self-described 'mage' — is being called to a Mexican-American family's home to perform a exorcism on a young woman named Maria. The woman has been possessed by a Hell-spawn demon; her body has been physically deformed by the possession (her arms have been extended into clawed appendages, her face has been distorted). Constantine arrives carrying a brass case containing his exorcism implements: holy water, blessed crucifixes, his 'Brass Knuckles' (ring-implements infused with holy energy), and various other ritual objects.

Constantine performs the exorcism through Catholic ritual procedure mixed with what the film calls 'cosmic-balance-restoration' techniques. The ritual is approximately 6 minutes of horror-movie screen time. The demon is forced out of Maria's body and back to Hell. Constantine notes during the exorcism that this is a unique demon — specifically, a 'soldier' demon that has been able to cross the cosmic Veil (the dimensional barrier separating Earth from Heaven and Hell). The Veil has been established as the foundational barrier preventing demons and angels from directly intervening in human affairs. The breach has been increasing in frequency across recent months.

Constantine is investigating an unusual spike in demon activity across Los Angeles. Specifically, demons have been crossing the cosmic Veil in increasing numbers — direct manifestations rather than the mediated-possession events Constantine usually encounters. The breach pattern suggests something is actively weakening the Veil. Constantine consults his contacts: Father Hennessy (Pruitt Taylor Vince), a Catholic priest with alcohol-fueled demonic-research expertise; Beeman (Max Baker), Constantine's occult-supplies dealer who has been collecting demonic artifacts; Midnite (Djimon Hounsou), a demonic-bouncer who runs a nightclub where supernatural-and-human entities maintain neutrality.

Constantine meets Detective Angela Dodson (Rachel Weisz) — a Los Angeles homicide detective whose identical-twin sister Isabel just committed suicide. Angela believes Isabel was murdered. Constantine discovers that Isabel had been possessed by Mammon — Satan's son — during her final moments. Isabel had jumped from a roof not in suicide but in self-sacrifice to prevent Mammon's broader Earth-emergence. Angela has been possessing latent psychic abilities since childhood; she has been suppressing them. Constantine recognizes her abilities and recruits her to assist his demon-hunt.

Constantine and Angela investigate the cosmic war between Heaven and Hell. They discover that Gabriel (Tilda Swinton) — God's lieutenant archangel and one of the highest-ranking divine beings — has been operating outside heaven's mandate. Gabriel has been allowing demons to cross the Veil in larger numbers, intentionally weakening the cosmic balance to force humanity into a state of survival-driven moral-elevation. Gabriel's thesis: humans remain morally-lazy when their broader existence is comfortable; suffering elevates moral character. The plan is rebellion against God's broader cosmic-mediation.

Mammon — Satan's son who has been prevented from crossing the Veil for millennia — has been the primary force breaching the barrier. Mammon's broader objective: emergence onto Earth as his own dimensional-being, separate from his father Lucifer's broader Hell-realm authority. Mammon is being protected by Gabriel's machinations — Gabriel has been diverting heavenly attention away from Mammon's breach attempts, allowing Mammon's Earth-emergence to proceed without heavenly intervention. Constantine and Angela realize they must stop both Gabriel and Mammon simultaneously.

The third-act confrontation takes place at Los Angeles' Ravenscar Mental Hospital — where Isabel had been institutionalized before her death, and where Mammon's emergence is being prepared. Constantine and Angela infiltrate the hospital. Mammon is attempting to emerge through Angela's body — using Angela's psychic abilities and her twin connection to Isabel as the cosmic gateway. Constantine intercepts the emergence at the last possible moment.

Constantine's final solution is suicide-by-Satan: he opens his wrists with a sword-blessing, knowing that Lucifer (Peter Stormare) will personally come to claim Constantine's soul. Constantine has been dying of lung cancer throughout the film — a consequence of his chain-smoking and his demon-hunting career. He has been destined for Hell since his teenage suicide attempt (which had opened his psychic abilities). His bargaining position with Lucifer: in exchange for Lucifer taking Mammon back to Hell, Constantine will agree to permanent damnation.

Lucifer arrives in Mammon-emergence chamber. He is depicted as a slender, immaculately-dressed white-suited business-attire-evil figure. Stormare's specific performance approach — combining elegant menace, ice-cold calculation, and the depiction of evil as bureaucratic rather than theatrical — has been referenced as one of the most-iconic Lucifer cinematic portrayals. Lucifer takes Mammon back to Hell. He also takes Constantine's soul. The deal appears completed.

In a final twist, God intervenes. Constantine has performed an act of pure self-sacrifice — he gave his life and his soul to save humanity. God's grace mechanism restores Constantine to life and removes his lung-cancer. Lucifer is forced to leave without claiming the soul. Constantine survives. Angela's psychic abilities remain canonical; her twin connection to Isabel is resolved. Gabriel is demoted to human status by God's intervention — losing his angelic powers and forced to live as a human on Earth.

The film's epilogue. Constantine returns to his demon-hunting career, no longer dying. He has been given a second chance by God's grace. He smokes a cigarette outside Angela's apartment — but it is a stick-of-gum rather than a tobacco-cigarette. The implication: Constantine has given up smoking, having been given a chance to extend his life. Angela watches from her window. The romantic tension between them is left unresolved — Constantine's mission requires solitary work. The film closes with Constantine driving away from Los Angeles in his black sedan.

Commercial and critical reception. Constantine grossed $230 million worldwide on a $100 million production budget — modest commercial success. Critics responded mixed (Rotten Tomatoes 45%); some praised the occult-thriller atmosphere and Reeves's restrained performance, others criticized the departure from Alan Moore and David Lloyd's Hellblazer source comics (where Constantine is a British Liverpool-born character, not a Los Angeles American). The film became a cult-classic across subsequent years. A Constantine sequel was announced in 2022 — to star Keanu Reeves and to be directed by Francis Lawrence. The sequel remains in pre-production as of 2025. The comic-character Hellblazer / John Constantine has continued comic-publication since the 1980s; Alan Moore's original Constantine creation remains in print.