If you watch the movie, most of the plot holes are explained, (locked windows, the boyfriend takes the key from the lock to stop the girl leaving early on in the film, the mother does scream when untied but her lover is lying on the floor with his head a bloody pulp from a baseball bat!) I could go on closing the holes, but suffice to say, It's not a great film, but I have seen a lot, lot worse. The cast is good and acting OK, but it is a story told many times before and in many cases better. I think it is a vehicle for some up and coming stars Kaya Scodelario and Ed Skrein to put on their CV as both are now in big budget Hollywood movies, Maze Runner and Transporter:Refueled respectively. GT