A British man gets caught up in an incident in Beijing and upon his return, he’s accused of foul play. Now he must go back to China to face his crimes.
Nolan recounts the events in Beijing, while Hana continues to investigate the events on-board. Meanwhile, Jess’s findings lead her to a mysterious company.
The truth about events on-board is revealed, forcing Hana to take drastic action, and Tennant is put in charge of Delaney’s operation, forcing Delaney to break protocol.
As the murder of a diplomatic courier leads DS Hana Li to London's US Embassy, MI5's Madeline Delaney receives a call about a bomb on the jet she is travelling on.
As Hana and Brody search for the killer, the embassy is put into lockdown but Fox remains one step ahead of them - meanwhile, a bomb is found on Delaney's jet.
Hana and Brody set a trap to catch Fox, Jess enlists surprising medical help to save Ruth's life, and the true architect of the conspiracy is finally revealed.