Blood Sisters (1987)

In 1974, a little boy tries to talk a little girl into getting naked for him, which she refuses and calls him a pervert. He then runs home, which happens to be a brothel. The little boy comes into one room to find his mother with her john, to which he reacts by blasting them both dead with a shotgun. Thirteen years later, a woman named Linda is taking the new pledges for her sorority to the now empty brothel for a scavenger hunt. The scavenger hunt in the empty house is to test their maturity and their courage, so if they finish the scavenger hunt without chickening out they can be part of the sorority. Once night falls the girls begin seeing ghostly apparitions, and eventually the girls begin getting killed one by one...