Series 18
Episodes
1. Sniper's Nest (1)
2015-01-06
Nikki and Jack strive to track down a sniper at large in London and stem a public crisis.
2. Sniper's Nest (2)
2015-01-07
Nikki and Jack investigate links between the victims to close the net on the killer.
3. Falling Angels (1)
2015-01-12
Nikki and Jack investigate a man killed by a train on the London underground.
4. Falling Angels (2)
2015-01-13
Nikki helps high-flying DI Luke Nelson unearth painful childhood memories.
5. Protection (1)
2015-01-19
A suspected paedophile is found murdered in a children's playground.
6. Protection (2)
2015-01-20
Nikki, Jack and Thomas focus in on Lizzie's movements on the night of Barge's murder.
7. Squaring the Circle (1)
2015-01-26
The nanny of a Russian oligarch is killed in a botched assassination attempt.
8. Squaring the Circle (2)
2015-01-27
A young woman working for the Doshis is found dead in Maksim's apartment.
9. One of Our Own (1)
2015-02-02
The Lyell team are under pressure to catch the killer of an admired Essex police officer.
10. One of Our Own (2)
2015-02-03
When the body of local criminal Jason Simons is found, the course of the case is changed.