Season 1

After a long, arduous hunt, Derek Ho, Singapore's first serial killer has been captured, tried and sentenced to death. As he awaits his fate in prison, a team of top psychologists is assigned to interview him. They must find out if he has any information on a list of women reported missing during the period of his killing spree. It takes a young, ambitious member of that team, Dr Winnie Low, to break through to the stubbornly reticent Derek. Winnie, herself, is suffering from the scars of brutal attack by one of her former patients, Kai, and agrees to the assignment with much trepidation. Derek and Winnie form a dangerous bond as she discovers an old faded photograph among his personal belongings seized by the police: a photo of Derek with a young girl whose face cannot be seen.