As the search for Liam continues, Nikki's loyalty towards her former mentor is tested.

When one boy is found dead and another is abducted, the team faces a race against time to find the missing child.

The team investigates the murder of a woman found dumped on the side of the road with her face removed.

Harry tangles with a Russian oligarch over the murder of a journalist.

Nikki faces mounting police hostility to her investigation of the armed raid.

Leo does community service on a rough estate after being done for drink-driving.

Frustration within the team builds as Harry and Nikki struggle to find any useful evidence from the post-mortems to help the police. No one will talk, and they have no leads. Leo worries for Levi, who is sucked further into a world of gangs and violence.

The team investigates an armed raid on a suspected terrorist cell in which two suspects and a police officer are killed.

Harry is drawn into the murder of a Hasidic man found on disused wasteland, while Leo investigates the death of an Australian backpacker.

A second Hasidic boy is killed, which convinces Harry they are looking for a Jewish killer.

The team is asked to investigate the death of a British medical student in Zambia.

Nikki clashes with Zambian police as she investigates the death of a British medical student.