Air date: 2015-01-06

Runtime: 60 min

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

Air date: 2015-01-07

Runtime: 60 min

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

Air date: 2015-01-12

Runtime: 60 min

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

Air date: 2015-01-13

Runtime: 60 min

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

Air date: 2015-01-19

Runtime: 60 min

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

Air date: 2015-01-20

Runtime: 60 min

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

Air date: 2015-01-26

Runtime: 60 min

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

Air date: 2015-01-27

Runtime: 60 min

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

Air date: 2015-02-02

Runtime: 60 min

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

Air date: 2015-02-03

Runtime: 60 min

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