Sunflower

About a deranged college professor keeping a girl hostage in a farm house out in the middle of nowhere. He's rigged the place with Level 16 super high tech security so that when he leaves for work there's no way for her to escape? Then kidnaps a second girl who he imprisons along with the first. He makes it quite obvious that only one of these girls is staying for the long-haul? It becomes about two girls fighting each other for their lives? the story never slows down.