This fourth season of Code of Law will see more hard-hitting and headline cases of brutal or heinous crimes that shocked Singapore. Lawyers Jacob Fernandez (Keagan Kang), Stephanie Szeto (Shu An Oon) and Sanjay Devaraj (Jitenram Kiran Bala), along with Razali Hamzah (Fauzie Laily), Nick Han (Sunny Pang) and Audrey Soh (Sharon Ismail) from the police force, will race against time to solve crimes and bring the perpetrators to justice. Amidst the challenging new cases, a captivating serial killer, Derek Ho (Desmond Tan), emerges. Derek Ho leads a double life. A suave and charming high-flying banker by day and by night, a murderer with an abnormal psychological gratification for killing. He is introduced to Stephanie and soon, the two are dating. As their relationship develops, the plot thickens as danger looms.