Stigmata (1999)

Frankie Paige, a young woman seemingly untouched by faith, finds her life violently upended when she begins manifesting the stigmata – the wounds of Christ. These excruciating episodes, far from being divine blessings, hint at something far darker at play. When word reaches the Vatican, the astute Cardinal sends Rev. Andrew Kiernan, an investigator with a keen mind for the inexplicable, to assess Frankie's disturbing affliction. What begins as a potential miracle quickly morphs into a chilling battle for Frankie's soul as Kiernan uncovers a sinister entity actively tormenting her, thrusting them both into a desperate race against time. While "Stigmata" is primarily a supernatural thriller, it earns its place on a "Best Mystery Movies" list through its compelling central enigma. The film masterfully weaves a tapestry of unanswered questions: Is Frankie truly chosen, or is she a victim of something else entirely? What is the nature of the force that possesses her, and what are its ultimate goals? Kiernan’s investigation serves as the audience’s lens, piecing together fragmented clues and unsettling occurrences to unravel the terrifying truth. The constant suspense, the gradual unveiling of the supernatural machinations, and the high stakes of uncovering the source of Frankie's torment all contribute to a deeply engaging and suspenseful mystery that keeps viewers guessing until the very end.