The case becomes personal for Moses as he tries to protect Joy, but in doing so he puts her in extreme danger. The police arrest Costello, but Solomon goes missing and the wave of terror reaches fever pitch. As they close in on the killer, Dan and Moses learn that British Intelligence has been across the case from the start.
In the final episode, Michael decides that the transatlantic to-ing and fro-ing has gone on long enough and that he and Edie need to truly commit to each other to make this work. In a rash mood, he flies to New York to propose that Edie marry him and come and live in London. But she is ideologically opposed to marriage and wants them to live together on a trial basis instead - in New York.
With the memorial for the London attack two days away and knowing there is a second bomb, Charlie convinces the team to help break Malik out of prison. Yates is duped into thinking that they are conducting regular surveillance on another threat.
While the second bomb is a priority, Rachel manages to delay the murder enquiry involving Rob as a suspect.
Steffi McBride works in a hotel kitchen but dreams of fulfilling her ambitions. She hangs out with her musician boyfriend Pete and is picked on by bitchy Lara and her side-kick Kim. But things are about to change for Steffi when she turns up at her amateur dramatics class...