A freezing night in the depths of a Seoul December brings a killer to one of the city's Red Light districts. By the time morning arrives, Senior Inspector Jun-young Choi has to investigate more than just a murder with a kidnapping added to the case. As the media clamour for answers and the Mama-sans close ranks, Choi will need his team's full cooperation before the kidnapped girl becomes just another statistic. But is this a case that goes beyond Korea's capital? And who is in the background, working to ensure this is Choi's last case?