As Ben goes missing, Boyd and his team try to force the truth out of a confused David. Boyd grows increasingly close to Sarah, and Stella travels to Poland to investigate the true story.
Boyd receives an anonymous package in the post - a Nazi ceremonial dagger. Attached to it is a Cold Case number, linking it to the unsolved murder of a young girl in May 1945. It seems that Mel had been working on the case before her death, what does this mean for the Cold Case Team?moreless
The case becomes more complicated as Boyd discovers that alternative practices may have contributed to Daniel's instability.
A psychiatric patient, imprisoned for the murder of his parents as a teenager, escapes and reveals the location of an unknown corpse.
The plot thickens as Rivelli and then Harris confess to the three cold case murders. Boyd remains suspicious though - who was the real murderer and what has Jensen got to do with it all?
Two days after James Jenson is released from a psychiatric unit, the wallets of his victims are sent to a relative. Does this mean more murders could follow? And is James really responsible for the three cold case murders, or did he take the blame for somebody else?
As tension builds between Grace and Boyd the truth about Lisa is revealed. Meanwhile, the team have a new lead following on from Declan's death and it's a race to find the murderer before Lisa does.
Two sexually conjoined mummies mysteriously fall through the ceiling of an old City bank, resulting in the Cold Case team being called in to investigate.
Boyd finds a connection between the recent murder of an Iraqi and the local ruler's skull taken from the Sudan by British troops more than a hundred years before.
MI6 asks Boyd to reopen the case of the killing of an Iraqi dissident. Meanwhile, a man running for election as President of the Sudan announces he is going on hunger strike to protest at Britain's refusal to return the skull of a 19th century leader.
Continuing the investigation of the death of a teenager whose body was found in concrete on a building site years ago. The injured Joe McDonagh finally wakes from his coma - but how much light can he throw now on a boxing bout which went badly wrong long ago?
The team re-investigates the death of a teenage boy who was found on a building site some years ago, drowned in concrete. Part of a human ear is found in his stomach, linking him to the dumping of another seriously injured teenager in a hospital at around the same time. The ground on which the dead teenager was found belongs to a Catholic abbey which is soon to be dissolved, and the abbey owns a shrine which might contain evidence and has to be dismantled - a task which falls to the unwilling Stella Goodman. Meanwhile, new forensic scientist Dr Eve Lockhart makes her mark on the case.moreless