Seeking answers, Heri finds a way to insert himself into the Malaysian investigation. Meanwhile, in Jakarta, for ICD Lieutenant Heriyanto Salim (Ario Bayu), the case turns personal when his brother is found murdered in similar circumstances. Called in to investigate, Singaporean International Crimes Division (ICD) officer Serena Teo (Rebecca Lim) takes charge of a case across the border where a family has been slaughtered aboard a luxury yacht in Johor.

A series of brutal murders, each sharing a signature MO, takes place across Malaysia and Indonesia.