My love story (Jeff the killer's sister)

After years of searching for 2 kids who suddenly disappeared after the mysterious death of two parents in there own house and bedroom, people start to believe that this 16 year old boy, Jeff, and his 5 year old little sister, Martha, had been taken and killed somewhere else. Ten years later, we find out that what was once a nice innocent little girl is now a 15 year old young girl who lives with her 26 year old brother, who has the need to go out on killing sprees and still be an overprotective older brother. Not only does Martha finally see the true side to Jeff, but she also meets this group of people who have no idea of her or Jeff's problems except for Michael, who seems to be there for her whenever Jeff goes crazy, but could this lead to something more....