i like this movie . unlike other thriller you learn to know the killer very well . you also get to know the two detective hunt them . the killer be two high school kid . they be very intelligent and want to prove they be smarter than the police so they plan the perfect crime . we all know this crime will not turn out perfect . what we do not know be if they will be catch and or may be just one of them and or even none . in a way i kind of hoped they both would get away with it and although i do not know if this be the movie intention . the story be tell in a nice way . you be start to get to know the people involve . the character of sandra bullock be likable but have her own secret and which work against her . ben chaplin be pretty good a sam and the two kid be both great . the scene between them be the good scene in the movie . i think you can say the movie be pretty good and not a predictable you would think . for a nice evening with a movie and murder by number be a good one .