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The discovery of two bodies in a freezer sheds unexpected light on the investigation.
The Lyell team examines the scene of murder of a family shot while picnicking. The SIO is convinced that the woman's estranged husband is responsible.
As the murders continue, Jack Hodgson investigates the capital's burgeoning gun trade.
The team is called on to investigate the fatal shooting of a teenager during an armed police operation. Doctors Alexander and Chamberlain question the integrity of the IPCC investigator.
Focus on one suspect prompts the team to re-open a fifteen-year-old murder case. The emergence of further victims points to a particularly sadistic killer.
After an ex-convict is murdered in his own home, suspicions fall on a recently-released killer.
The team must track down Sarah Begovic and the suspected members of her terrorist cell before they can strike again.
A young Muslim woman returning covertly to the UK is initially suspected of drug smuggling, but is soon implicated in the murder of a prominent critic of Islamic fundamentalism.