The team tries to unravel the connection between a major drugs network and a Bosnia war crime. Meanwhile, the Serb refugee undetakes her own investigation.
At the scene of a road accident, a DNA link is found that goes back to the Bosnia / Serbia conflict, which Eve had to deal with when working on mass war graves.
The surviving members of the wilderness group have received threatening letters, and another of them has died. The team try to get to the bottom of events in 1996.
The team find out that a body discovered in a disused tunnel is that of salesman Chris Dearden, who went missing in 1996. He was on a self-empowerment weekend with his colleagues when he died. Could one of them be responsible?
The team have to race against time to solve the waste ground murder, as it becomes clear that a child's life may depend upon it.
After they get a tip off in an anonymous e-mail, the team head to a waste ground in east London, where they find the remains of a right-wing fascist activist.
The team continue questioning members of the regiment, as Boyd becomes convinced that the murders relate to events in Basra. An Iraqi woman provides the necessary information.
A dog opens a new case for the team when it digs up some human remains. After research the team finds a connection with another corpse that was found headless two years earlier near army barracks. In these barracks a dinner took place which the two men might have attended. The team find their investigation hampered by senior military ranks.moreless
After the discovery of Terry Ryan's body buried in a field, more corpses are uncovered… leading Grace to think it is a ritual burial site. Meanwhile Boyd and the team race to find Dr Hooper, whom Kelleher has taken hostage. And back in the lab Eve makes a shocking discovery.
The Cold Case team investigate the mystery surrounding the murder of a prison governor after his head is fished out of a canal six years after his murder.
The Cold Case squad discover that what at first looks like evidence of a snuff movie, and a case about prostitution and sexual violence, turns out to be the unearthing of a terrorist cell comprising three women: Una Doyle, Lore Dutana and Fatima.
The DNA of a woman caught on CCTV camera defending her daughter from a mugger is found to match that discovered at a murder scene in 1990. Meanwhile, Boyd's emotions are challenged when there's news about his son who's been missing for seven years.