Nikiya Mathis

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.

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

Danny begins an extra job working as a bodyguard which turns into a case while Frank feels the pressure to promote Gormley and Jamie reflects on staying with Eddie.

As Naz learns the survival rules in Rikers, his parents are tempted by a counteroffer for their son's defence.

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.

After an unexpected trip home, Mia experiences complicated feelings that may threaten her relationship with Marcus.