A very rough twist/revelation happens near the end, and that alone makes the whole movie worthy. It's also well-made, well-written, and got decent acting, my favorite being the lady that plays the twin daughter. It is also one of those rare movies that let a tear escape from my eyes... the bus deception incident.
The movie took things a little far by having this mother be an assassin. Also, her old age make-up could be better.