Silent Witness : Season 21

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 (Emma Fielding) 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?

A series of tragic events are linked to the hacking of a hospital database.

The team wonder if the hack is the only danger as they come under threat.

A US diplomat is shot dead in central London, forcing the team to work closely with the embassy and the FBI.

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. Together, the team uncover a secret that has been held by those at the very top of the US government.

While two care home staff are chasing Kevin McDowd, a young man with learning disabilities and sociopathic tendencies, Nikki and Jack examine a fatal road accident where the deceased is Kevin McDowd’s mother. The investigation led by police sergeant Button should be straightforward, but the forensic evidence suggests foul play.

The team are determined to uncover the truth about unexplained deaths of patients at a care home. They are desperate to rescue Serena and return her to safety. Unbeknownst to her colleagues in the Lyell Centre, Clarissa allows herself to be admitted to the care home in order to investigate. Her determination to find out what happened at the care home leads her to uncover a shocking truth, but puts her life in danger.