[3] An insane nun named Sister Ursula terrorizes her students at a Catholic boarding school.

Eventually, the malicious and aggressive Ursula discovers her secret and tries to force an abortion on her with a bathroom appliance.

They swear an oath of secrecy, and the Spanish Authorities of Barcelona simply report the Sister missing.

The vengeful soul of the nun is freed from her watery prison, and leaves to wreak havoc on the girls who were her mortal downfall.

There, she meets the other survivors, and together with her friends, they defend themselves from Ursula's spirit whilst desperately trying to figure out how to banish the nun once and for all.

After Joanna's death in London, Christy, along with all the other girls involved in the Ursula incident, suspect that it has something to do with the murder they had committed years earlier.

Eve has seen the killer to be Ursula but Mary's friends, Susan and Zoe explain that this is impossible because they had taken her life years before.

The spirit of the dead nun appears and passes right through Eve and she receives a vision of her mother in the past, speaking on the phone to a man named Miguel.