Silent Witness

Haunted by her experiences in Mexico, Nikki Alexander is struggling to come to terms with life back home. Whilst on leave she seeks out fellow pathologist Sally Vaughan for support. However, a few days later and troubled by the failure of Sally to return her calls, Nikki heads to her house only to find that it has become a crime scene and Sally is nowhere to be found.

Nikki's suspicions over David Cannon are further aroused when she discovers blood in the boot of his car. With Thomas' support she takes samples to test for DNA. Does it belong to Sally Vaughn?

Nikki and Jack continue to deal with their feelings post-Mexico in their own very different ways. Jack is boxing with his sparring partner Naomi Silva when he is called to a crime scene. Nikki examines the body of a young woman, Karen Sawyers while Jack is surprised to find the SIO on the case turns out to be DCI Naomi Silva. The first prime suspect is Karen's husband, Pete who is discovered covered in blood and clearly suffering. The forensic evidence takes them to a cosmetic clinic where a pregnant Karen had been receiving various treatments seemingly for free.

Nikki comes face-to-face with Simon Laing once again as the motive for the murders appears to be blackmail. The hospital computer database has been hacked and Clarissa and Max follow the forensic clues to a teenage hacker called Splinter. The danger comes much closer to home, however, when Nikki receives a threatening text with a picture of Rosie and the ominous message - 'lose the evidence'.

Diplomat Ryan Reed is watching the US ambassador on a late night current affairs show. However, when heading home he is seemingly targeted by an assassin. Led by SIO DCI Ben Solomon, the Lyell team arrive at the scene to find Reed's body posed - sitting upright on a bench with his hand tucked inside his jacket. An argument ensues between the Police and the US Embassy staff who claim the murder falls under their jurisdiction. Our team have to fight against the bureaucracy of the FBI, aided only by the US Chief of Mission - Matt Garcia.

Nikki is still in shock as the team arrive at Matt's residence but insists on working at the Lyell, determined to help. When analysing crime scene photos and the positions of the victims bodies, Nikki realises there is a pattern and together the team uncover a secret that has been held by those at the very top of the US government.

A road traffic accident points to the sociopathic behavior of a care home resident but is the suspicion justified? The Team peel back the veneer of care in pursuit of a perpetrator.

The team continue to investigate the truth around the unexplained care home deaths. Clarissa's determination to find out the shocking truth about the events going on puts her life in danger.

It is Christmas morning and Nikki, is awaiting a call from Matt who is back in the States. Instead, she receives a call to say that the team is needed: a family has been massacred at an enormous property owned by Andy McMorris, the CEO of a haulage company. Greeted by SIO DI Gibbs, Nikki is first on the scene whilst Clarissa is connected to the action via screens and microphones back at the Lyell. Having left his father to celebrate Christmas without him, Jack is just arriving to join them when a gunshot suddenly rings out.

As the truth behind the McMorris family is revealed, the team is brought together by the conclusion of a shocking Christmas family tragedy. Reuniting with their respective families, Nikki finds her secret Santa gift is a visit from a loved one.