As the FBI pursues "the man in the suit," Reese is even more determined to protect the latest person of interest after learning she is the sister of a soldier who was killed in action.
Finch goes under cover to protect a youth who reminds him of himself; Carter goes on a dangerous mission for the FBI.
Carter tries to help Reese by engaging in mental warfare with the FBI and Detective Fusco must protect supermodel Karolina Kurkova, the latest person of interest.