In a particular church, Sister Blessing, a devoted choir member, must avenge the dead of his dead lover by ensuring that no one attains the position of the choir mistress. A position she believed belong to his dead lover, Sister Mary. In order to achieve this, she must blackmail anyone who tries to move to this position, destroy every possible potential, offer herself as a sex machine, while maintaining the hypocritical born-again nature of hers. She must also, listen to instructions from her dead lover, who together with her, works to attain this position! Blood on the Altar contains extreme sexual contents.