Joshua Riggs prepares a massive arms deal with Wu LoPan, a notorious Chinese crime lord, even as Chase, August, and Samantha began to systematically take down his organization. In retaliation, Riggs kidnaps Captain Jensen, further igniting the detectives' determination to bring him in. Things get even more dangerous when the detectives become the targets of assassins. And when Kendra goes into labor, August is worried he may not be there to see the birth of his first child. The detectives must call upon all their resources when it comes to the final all-out explosive climax, and the choice must be made: bring in Riggs by the law or by vengeance.