Danny picks up a bodyguard job on the side, working for an ex-con who took the fall for someone else. Eddie and Jamie reflect on their relationship, while Gormley's wife makes a request.
Elizabeth makes a secret trip to Iran in hope of preventing a coup that could impact President Dalton's administration; Elizabeth's staff are brought up to speed on the investigation into Marsh's death.
Finch tries to protect a 911 operator by going under cover 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.
Awaiting arraignment at Rikers Island, a nervous Naz considers the extent to which his survival relies upon another inmate.