When the pathologists investigate three suspicious deaths in one night on the same ward, it looks like hospital staff may be behind their murders. Nikki becomes increasingly disturbed by a rape and murder case involving a young child.

Nikki's mental instability worsens, and Harry and Leo are forced to get her psychiatric help. But then when the true identity of the murderer is discovered, it becomes a race against time to save Nikki's life.

Leo finds himself haunted by past memories when he returns to Sheffield after an ancient body is unearthed on Bleaklow Moor.

After a preserved female body is discovered buried in a peat moor in Sheffield, DI Sonia Hardwick turns to an archaeologist called Professor Patrick Cain for help. is able to Patrick persuade the coroner to release the body for examination to the Lyell centre in London much to Sonia's annoyance. Nikki, Harry and Janet are worried about Leo. Nikki discovers knife wounds to the hands which the professor believes may indicate a ritual killing as the autopsy on the body is carried out. Further wounds discovered around the abdomen and genitalia suggest though that it could of been a sexually motivated attack. Leo ends up searching through his archives for a case he dealt with in Sheffield in 1985 that were committed by self-confessed serial killer Karl Bentley. As he examines the body himself he is caught by Nikki and Leo tells him he thinks the body could belong to a woman called Jodie Fisher who went missing at the time.

Part one of two. Nikki is called to perform a post mortem on the body of a woman found in a river, and the discovery that she had recently given birth causes the pathologist to worry her child may be abandoned somewhere. Meanwhile, Harry investigates the apparent suicide of a lieutenant at a nearby Army base, and suspicions soon arise that the two cases may be linked. Starring Emilia Fox and Tom Ward

Part two of two. An X-ray of Lt Lockford's skull reveals a second bullet, confirming suspicions that he was murdered. Meanwhile, Danny Ferris's father is not satisfied with the verdict on his son's death, and asks Nikki to perform a second post-mortem, and as the investigation continues to unravel, a tragic secret is revealed at Hillsdon Army Base. Crime drama, starring Emilia Fox

Harry is reunited with Anna Sandor when she calls him to Budapest to perform a second post-mortem on the body of a drowned prostitute, Sofi Mustafova. As they get reacquainted, Anna tells him she believes the death is suspicious and may be linked to her own investigations into the disappearance of other pregnant prostitutes. The women's body ends up being cremated before Harry can take a look at it. Harry's world is crushed when he finds out that Anna has been stabbed to death in her bed. He is forced to go underground where he manages to make a desperate call to Leo in London for help when he becomes the number one suspect. Harry continues with the investigation into the gang-run prostitution racket. When Leo shows up late for the meeting with Harry he witnesses a man being shot and burned. When he manages to retrieve a charred passport from the body it turns out to be Harry's.

Nikki makes her way to Budapest but there's not much she or Leo can do as every move they make is being watched by Tibor Orban. Leo manages to secretly meet Nikki where he reveals that Harry is still alive. Harry explains why he had to fake his own death and continues that he must find out why Anna was killed and unravel the dark secret of the prostitution racket.

Chief Inspector Rebecca Woods and some members of the Diplomatic Protection Group head to the Dutch embassy to investigate a shooting. They disscover Ambassador, Pieter Van Buren, holding his wounded daughter Klara. He demands that the the DPG team leave and Woods has no choice but to agree given it is officially Dutch territory. After Pieter leaves the building, carrying Klara, he informs the police that his grandson, Jack, is missing. DPG Sergeant Whitehead is found shot in the bulding after the polive go in. Pieter is scared that history could be repeating itself as his own son, Jacob, went missing from the family home in 1996 and was never seen again. When Klara begins to recover in hospital, her memory comes back and she remembers who carried out the shootings.

Harry discovers evidence of extensive plastic surgery on the corpse of the bodyguard as an autopsy is carried out. He also manages to locate the missing boy, Jack Van Buren, who is hiding in the basement of the Embassy. Nikki takes a look at the evidence from the 1996 disappearance of Jacob and learns that a DNA sample from Pieter's dead brother, Diederick, matches the profile of the dead bodyguard. The Van Burens' version of what happens becomes increasingly unlikely and when the body of the family's au pair, Mary Olivant, is found hanged near the Van Buren family home, Leo discovers the remains of a young boy in the ground. Klara ends up confessing that she was responsible for the shootings.