Series 18

E1. Sniper's Nest (1)

Jan 6, 2015 · 60m

Nikki and Jack strive to track down a sniper at large in London and stem a public crisis.

E2. Sniper's Nest (2)

Jan 7, 2015 · 60m

Nikki and Jack investigate links between the victims to close the net on the killer.

E3. Falling Angels (1)

Jan 12, 2015 · 60m

Nikki and Jack investigate a man killed by a train on the London underground.

E4. Falling Angels (2)

Jan 13, 2015 · 60m

Nikki helps high-flying DI Luke Nelson unearth painful childhood memories.

E5. Protection (1)

Jan 19, 2015 · 60m

A suspected paedophile is found murdered in a children's playground.

E6. Protection (2)

Jan 20, 2015 · 60m

Nikki, Jack and Thomas focus in on Lizzie's movements on the night of Barge's murder.

E7. Squaring the Circle (1)

Jan 26, 2015 · 60m

The nanny of a Russian oligarch is killed in a botched assassination attempt.

E8. Squaring the Circle (2)

Jan 27, 2015 · 60m

A young woman working for the Doshis is found dead in Maksim's apartment.

E9. One of Our Own (1)

Feb 2, 2015 · 60m

The Lyell team are under pressure to catch the killer of an admired Essex police officer.

E10. One of Our Own (2)

Feb 3, 2015 · 60m

When the body of local criminal Jason Simons is found, the course of the case is changed.