Series 18
01. Sniper's Nest (1)
Nikki and Jack strive to track down a sniper at large in London and stem a public crisis.
02. Sniper's Nest (2)
Nikki and Jack investigate links between the victims to close the net on the killer.
03. Falling Angels (1)
Nikki and Jack investigate a man killed by a train on the London underground.
04. Falling Angels (2)
Nikki helps high-flying DI Luke Nelson unearth painful childhood memories.
05. Protection (1)
A suspected paedophile is found murdered in a children's playground.
06. Protection (2)
Nikki, Jack and Thomas focus in on Lizzie's movements on the night of Barge's murder.
07. Squaring the Circle (1)
The nanny of a Russian oligarch is killed in a botched assassination attempt.
08. Squaring the Circle (2)
A young woman working for the Doshis is found dead in Maksim's apartment.
09. One of Our Own (1)
The Lyell team are under pressure to catch the killer of an admired Essex police officer.
10. One of Our Own (2)
When the body of local criminal Jason Simons is found, the course of the case is changed.