Something I am hoping to see in a sequel:

I really hate those people who pay good money for the privilege of torturing people to death. Unlike most serial killers or serial rapists or other types of sickos (think Ariel Castro or Richard Allen Davis) they are RICH, very rich and they live pampered life styles where they are treated with respect and prestige.

So THIS is what I want to see, one of those rich men CAUGHT when the whole evil operation is busted and sentenced to life in prison with no possibility of parole and not a "country club" prison for rich people but a REAL prison an especially rough one. Then I want him hated by the other inmates the way child molesters and serial rapists often are.

An ending similar to Kunjite forbidden subjects or the Tom Sellick movie AN INNOCENT MAN where you see that the once very wealthy person is going to not just be in prison for the rest of their lives but will be hated by the other inmates and beaten up and raped on a regular basis, to see the look of terror in their eyes.