Part 1 is missing so I'll explain:
The young woman's sister has died in a mental hospital and was trying to warn her to not go to the House (House on Haunted Hill). But she and a group of people go anyway :)
Natalia is a 19-year-old novice travel the jungle in search of a mystical plant. There, they find a world of Black Masses, strange pregnancies, bloody deaths and for the nun herself, a sexually violent clash with the Devil himself.