Brian and Charlie (B & C) work for a gangster. When the boss learns they want to leave , he sets them up to be killed, after they help rob the local Triads of their drug dealing profits. B & C decide to steal the money for themselves, but when their escape doesn t go to plan, they have to seek refuge in a Nuns teacher training school. Disguised as nuns, B & C have to avoid their boss, Triads, police and Brian s girlfriend. There s also the problem of them being men disguised as nuns in an all women institution.

Upon taking her vows to become a nun, Sister Sarah is abused, brainwashed and drugged into submission by the corrupt clergy. On the verge of death from a lethal dose of drugs, Sister Sarah receives a message from GOD telling her to take vengeance on all those who did her wrong. Armed with God s will and an arsenal of big guns, she dispenses Judgment Day on her former tormentors. When the church hires the merciless motorcycle gang the Los Muertos to track down and kill her they soon realize that this SISTER IS ONE BAD MOTHER.

After being betrayed and left for dead, members of a CIA black ops team root out those who targeted them for assassination.