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.
Sherlock tries to catch Martin Ennis, an erratic criminal, before he strikes again; Sherlock works with an FBI profiler who wrote a book on Ennis; Watson may be evicted from her apartment.
Holmes and Watson investigate the murder of a criminal who made his living by stealing from other criminals; Capt. Gregson returns and suspects his interim replacement is responsible for one of his best detective's suspicious departure.
A resident of the low-income section of a luxury apartment building is murdered; Frank is upset with a detective who takes advantage of legal loopholes.
Cary hires a prison consultant to prepare him for incarceration while the team at Florrick/Agos/Lockhart does everything in its power to help him. Meanwhile, Alicia practices for the State's Attorney candidates' debate. Chris Elliott and Domenick Lombardozzi guest star.