数字谋杀案

探员凯西（桑德拉·布洛克 Sandra Bullock 饰）的有勇有谋人尽皆知，而此次摆在她面前的案件却让她伤透了脑经，这宗案件不仅案情扑朔迷离，手法更是完美得找不到一丝漏洞。山姆（本·卓别林 Ben Chaplin 饰）受命协助凯西办案，可是对于这个做事毛毛躁躁的楞头青，凯西却并不信任，她觉得山姆资历尚浅，凭借的不过是纸上谈兵的本事。 　　随着调查的深入，凯西终于找到了突破口，名叫理查德（瑞恩·高斯林 Ryan Gosling 饰）和贾斯汀（迈克尔·皮特 Michael Pitt 饰）的两名少年出现在了她的视线中。然而，凯西无法相信，竟然是这两个看似善良的少年犯下了如此邪恶的罪行。当犯罪动机渐渐显露，一个残酷而又冷血的世界逐渐露出了真容。Richard Haywood, a Californian high school's coolest kid, secretly teams up with another rich kid in his class, brilliant nerd Justin 'Bonaparte' Pendleton, whose erudition, specially in forensic matters, allows them to plan elaborately perfect murders, just for the kick, for which they set up Richard's marijuana supplier, their school's janitor Ray Feathers, as a psychotic serial killer. The case is assigned to detectives Cassie 'the hyena' Mayweather, who carries a sequoia-size chip on the shoulder from her previous life, and her brilliant new partner, Sam Kennedy, who just transferred from the vice squad; they can work together very well, and even fit romantically, but fall out over different professional attitudes towards the investigation, which Captain Rod Cody and her understandably vindictive abused ex, Assistant D.A. Al Swanson, soon ban her from when she disobeys instructions and hand to him. When the plotting boys both dig class-mate Lisa Mills, their unnatural bond comes under stress- will it break, allowing the hard-pressed police to bring them down?