John Constantine, the protagonist of the film, is a Los Angeles-based exorcist gifted with the ability to perceive angels and demons hidden within the human world. Haunted by a traumatic childhood, he once attempted suicide, an act that condemned his soul to hell. Seeking redemption, Constantine dedicates his life to exorcising demonic entities, hoping to alter his eternal fate. The narrative unfolds as Constantine aids police detective Angela Dodson in investigating the mysterious death of her twin sister. As their inquiry progresses, they uncover a sinister conspiracy involving the son of hell and celestial forces, revealing a conflict that threatens the balance between good and evil.