简介
A noise is coming from the floor upstairs. Eunsu, hears this for over a month which causes uncontrollable anger to rise up. She gets eliminated again from a competition she had prepared for a long time. Eunsu decides to write her last piece with the theme of the noise between the floors and persuades her friend to help her follow and track the secret.。上世纪50年代。北京公安局的干警龙飞和同事应山红受命前往江南，开展新的工作。多年以前，还是地下工作人员的龙飞与昔日的恋人鸽子曾在这里共同工作生活过。后因工作调度，两人失散，鸽子至今下落不明。
之后的工作过程中，龙飞发现烈士蒋仁被捕之事居然和鸽子有着千丝万缕的关联。在应山红的配合下，龙飞找到了证人杜胜奎、孔雀、和红隼等人，并从他们口中得到了重要证据。但是，龙飞的工作过程却时而清晰可见，时而扑朔迷离。
究竟是谁出卖了当年地下工作的同志？昔日恋人鸽子和此事到底有什么关系？ 龙飞最终驱散重重雾霭，悬念揭晓，一切真相大白。。A police chief hires an old friend, who is an international spy, to help him search for a wanted suspect in the Philippines. When the chief dies, all evidence points towards the spy, and he must go to extremes to defend himself.。