Here's what NETFLIX says:
When he was 9 years old, Tim and his mother were abducted by serial killer Bob. While Tim's mother fell victim to Bob, Tim was kept as a chained slave, forced to bury the bodies of the young women Bob drags home and keep scrapbooks of the crimes.
Great movie!! I didn't expect the ending, not at all!! I really enjoyed how this boy was made to grow into the lifestyle and made him scrapbook all the killings. Pretty good thriller movie!!