Mona is released from custody and agrees to become a tasked witness, promising to help the police bring Danny in as an informant. But the fallout from her actions at home is disastrous, and her marriage is under more strain than ever.

With his client Mr. Khalid now in police custody, Guy is forced into a difficult decision about his own loyalties, whilst Danny and Hamoud await instructions about the target of the planned attack. A shell-shocked Mona is reunited with her loved ones and attempts to put the pieces of her family back together again. However, Barnes and the counter terrorism police face a desperate race against time to stop more attacks on London and save Danny before it's too late.