This gem is fantastic, it fully explored the darkside of people and the elements of Love, Sex, Murder and Normality. What's really considered as normal??? The acting was natural and thoroughly conveyed the idea of mental illness. You really cannot trust anyone, not even your twin sister in this case. The sisters are amazing, partly thanks to the script. Gosh, it's one of the most disturbing films I've seen, but by far the most interesting one.