传奇卧底爆seed归来，发现世界天翻地覆。昔日如师如友的搭档卓凯疑似变节，空降上司韦作荣作风强硬。敌友难分，关系错综，一场关乎每个人安危的对决，正愈演愈烈！

Follows an investigator as he prevents a terrorist attack during a symposium held by Hong Kong's Independent Commission Against Corruption. He later finds it has links to human trafficking in Thailand.

华裔女队长魏晓晨带领特警队，捣破人口贩卖集团基地，发现一具女性尸体，竟然是孪生妹妹梁曦，晓晨悲痛欲绝，发誓要用余生追查妹妹被杀真相。