Instruct: Classify the given review into positive or negative sentiment.
Query: Very well acted and directed.

Clint Eastwood's Mystic River is a very poweful and touching film. All the actors do an amazing job and this is Eastwood' best work (as a director) since "A Perfect World". There is one thing that doesn't make sense, though -- the two killers, one of them loved by the victim. Why do they beat her with bats and kill her? What for? Money? Fun? You tell me why these little monsters had to kill a 19-year-old girl. I like movies where you can watch them 100 times and still discovering new things, like in "Chinatown" or "Blue Velvet". I don't think is the case with Mystic River, but I'll watch it again for the third time and who knows, maybe there is an explanation for the killing, which occurs off-screen. However, Mystic River still is a great achievement.