Shadow Theory (2015)

Don't question why people go insane, question why they don't.

While battling her own demons, Detective Olson is determined to catch a sadistic killer. The only clues left behind are the victim's bloody remains and the sole survivor, a 17 year old boy. While they try to determine why the boy's family was targeted, the boy begins to question human nature, and the evil that could be lurking deep inside us all.