Somewhere in sin-ridden Mexico, even the clergy are willing to fall. A church bishop colludes with drug trafficker Chavo (David Casto David Castro) to force nuns to make and transport drugs. In a drug trade, two nuns are killed as a result of a lost bag of white powder, while Sister Sarah (Asun Ortega), who narrowly escapes, is arrested by Chavo into his prostitution house and abused by human beings. The dying Sister Sarah, who was rescued by a black market doctor, seemed to hear the teachings of God in a coma, guiding her to take up arms to cleanse the world of filth and sin. A year later, Sister Sarah made a comeback, carried out a bloody purge of the fallen clergy, and set her ultimate goal on the evil Chavo. God's punishment comes, and no one can avoid it.