Nikiya Mathis

Finch tries to protect a 911 operator by going undercover in an emergency call centre; the threat proves to be larger than anticipated.

Sherlock pursues Martin Ennis, an unpredictable criminal, before he strikes again. During the investigation, Sherlock is forced to work alongside Kathryn Drummond, the FBI profiler who literally wrote the book on Ennis.

When an inmate comes in with an entirely preventable illness, Max, Sharpe and Iggy head directly to the source -- Rikers Island; Bloom struggles with her recovery; Reynolds gets news that could change his life.

When Danny accepts a side job as a bodyguard for an ex-con who took the fall for someone else, he uses the opportunity to go after the real criminal.

Naz is transferred to Rikers Island, where he is acquainted with prison kingpin Freddy (Michael Kenneth Williams) who presents him with an offer.

Elizabeth makes a secret trip to Iran in hope of preventing a coup that could impact President Dalton's administration; Elizabeth's staff is brought up to speed on the investigation into Marsh's death.