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.
When a second embassy guest is murdered, it's discovered that both victims were part of a panel that blamed the crash of the D-300 on Russia.
Hana finds a clue which changes everything, Delaney and Peterson try to defuse the bomb onboard the jet, and Banks and Jess uncover vital evidence.
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.
The true nature of the conspiracy is revealed as Hana and Brody overcome their personal demons and work with Delaney to deliver justice.
Jing Lusi
DC Hana Li
Martin Compston
RSO Clay Brody
Nicholas Rowe
DSEC Alex Peterson
Trevor White
US Ambassador Ronald Tillman
Tom Forbes
Fox
Cash Holland
Ruth Banks
Steph Lacey
Megan Campbell
Guy Williams
Air Marshal John Johnson
Lesley Sharp
Director General Madeline Delaney
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