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.
When his increasingly depraved behavior spirals out of control, Marcus retreats to his family home along the New England coast. But instead of finding solace, Marcus is haunted by his darkest fears and deepest desires.
Please keep in mind that this is merely my opinion, and this will be almost strictly horror. You could say "What's Halloween without Hocus Pocus and Halloweentown?" and that's fine but also cliched and not horror. This is not a list of my favorite horror movies by any means either, just a list of great ones I think are fun to watch at Halloween time and give me that sense of Horrorween (my new favorite word btw). I have also included some horror television in here as well just for the short attention span people (aka me).