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 son of one of Sean's old associates commits suicide, suspicions regarding his death arise. King and Maxwell's investigation opens up an unexpected case involving a killer targeting the family members of former Secret Service agents.