Sachiko lost her parents at an early age and lived together with her only sister Nobuko who worked for a newspaper. Out of the blue, she is told that Nobuko is killed in an accident, but she simply cannot believe it because her sister had told her she was going to an entirely different place. She begins her investigations on her sister’s mysterious death with the help of Nobuko’s colleague and journalist Ryoichi. And when another colleague, Tomoe commits suicide, Sachiko has a gut feeling that a well-known figure is involved in the death of her sister...

昭和35年12月11日凌晨，一名老人陈尸东京市蒲田车站的车场内，身上没有任何可以证明身份的物品，甚至连面颊也被刻意损毁。警方迅速介入调查，根据对周边设施商户的探访，发现该死者似乎曾在前一晚出现在某个餐馆内，死者操着东北口音和某个熟人聊天，过程中还特别提到“Kameda”这个词，警方以此为线索，对东北地区所有姓龟田（Kameda）的人展开盘查，却一无所获。青年警官吉村弘（玉木宏 饰）意外从相熟的女记者山下洋子（中谷美紀 饰）得到线索，确定Kameda实际应是一个地名。与此同时，某剧团女演员成濑理惠子自杀，她的死亡奇妙地和那宗毫无头绪的案件联系起来……
本片根据日本著名推理小说作家松本清张的经典名作改编。