When FBI Agent Carter is suspended after assaulting an officer, King and Maxwell begin to investigate the circumstances surrounding the incident. What they find leads them on a bizarre trail involving clues from Carter’s most recent case. Meanwhile, Sean reveals more about his past as a Secret Service Agent and the mistake that led to his downfall.
When the key witness to a company's deadly chemical spill is murdered inside FBI headquarters, King and Maxwell are trapped in the building. With a killer on the loose and Special Agent Rigby's career on the line, they have only hours to solve the murder and find a new witness to testify at a Senate hearing to bring the company to justice.