What was the damn Pact?
Maybe I wasn't paying close enough attention but I didn't see any pact. Did I miss it? Was it implied? What was the damn Pact and who was it between?
The only thing I can think of is the sister had a pact with the murderer brother to let him stay in the basement and kill people. That's the only pact that would make sense but I didn't notice it in the movie. Are we supposed to assume that's what happened or did I completely miss something?