This should properly be called "Step Daddy's Girl", which isn't quite as disgusting as the incest implied here initially. Sadly, everything else is disgusting. The villain of the piece is a serial killer who served in Iraq. It wasn't his wartime experience that turned him into what he is, rather he appears to have joined the military for the express purpose of killing and torturing, not necesssarily in that order.
Now he is located in rural America living with his stepdaughter, her mother having committed suicide some years before. Although he isn't particularly attractive, he finds it remarkably easy with a little help from his companion to pick up reasonably attractive young women, take them home, and torture them. There is no suggestion even of rape, just pure sadism and bloodlust.
Fortunately, he is soon recognised by a local lawman who also served in Iraq, although he looks far too young to have done so. There is a resolution and a somewhat unusual final scene, but apart from that, this modern day film noir in colour has no merit at all.
