When the paths of a gifted female student, a cellist, an autistic teenager, a police officer, a prostitute, a teacher and a dog are entwined the very night a human head is discovered, attempting to crack the intriguing case leads to keywords all starting with the letter 'G'. As the investigation continues, the complexity of the lives of Hong Kong people, the desperation faced by both locals and immigrants living in Hong Kong today are slowly uncovered and a suspenseful multifarious Hong Kong story is revealed. 想看。符号间的世界 人群间的成见。出乎意料，值回一票。 一声哀号划破了优美的巴哈乐章，一颗带血人头从阳台滚落屋内，受害者身首异处，死状奇惨。查明尸体身份后，警方很快锁定六位嫌犯：黑白通吃的暴力恶警、患有亚氏保加症的自闭宅男、大胆染指学生的名校教师、家庭破碎后寂寞抑郁的学霸少女、终日闭门苦练琴艺的边缘少年，以及隻身赴港求存却屡遭歧视的南漂妓女，每人都与死者有着复杂难解的恩怨情仇。如果真相只有一个，凶手将会是谁？
