Silent Witness

Fresh from her trip to the States, Nikki and the Lyell unit are called in to investigate an attack against a transgender man. A transgender helpline had received a chilling phone call stating an intent to kill, and the call handler, a young, dynamic spokeswoman for the transgender community, helps with the investigation. When two further attacks are reported, one leaving a potential witness, it looks like the team are facing an outbreak of violence against the transgender community.

A mistake has been made during the course of the investigation, and Thomas is targeted as a scapegoat. As frustration grows between the Lyell and the acting DCI, can Thomas rally the team to gather crucial evidence to find the killer before they strike again?

After a teenage boy is senselessly killed in a meth lab explosion, his head teacher resolves to confront the drug dealers preying on his community. Dangerous batches of new drugs are hitting the streets, and the effects are evident to Nikki, Jack, Clarissa and Thomas as they deal with the rise in both violent and accidental deaths

When tragedy strikes close to home, it puts head teacher Noah Taylor on a collision course with the criminals responsible. Can the Lyell team help him stop the cycle of violence?

During a heatwave in Brighton, the Lyell team are summoned to a waste dump where a body part has been found. The search is on to recover the other dismembered remains and piece together the victim's body, which is covered in unusual tattoos. Meanwhile, Nikki is desperate to contact Matt but must wait until he visits from Washington.

With the remains of a second victim appearing in a Brighton recycling plant, it seems the Lyell team are on the trail of a serial killer. Working closely with local detectives DI Taramelli and DS Quicke, they must painstakingly piece together the evidence and unearth the connections between a diverse range of suspects.

A shocking incident on a suburban street brings back painful memories for Jack, forcing him to revisit his past. As a member of the victim's family seeks justice of their own, forensic evidence discovered by the Lyell team suggests the involvement of a Northern Irish terror group, long thought inactive.

During the team's search for the killer, Jack works alongside an old friend from Northern Ireland, a fearless journalist who has dedicated her life to exposing the suspected organisation. As the team investigate further, they realise they have uncovered a complex conflict sustained by ties of loyalty, family and retribution.

Nikki is humiliated in court when a barrister accuses her of making a serious error in the case of a policeman who may or may not have been murdered. Meanwhile the team investigates the death of a medical researcher found in a canal with mysterious puncture marks on his body.

When Thomas sides against her findings on a controversial case, Nikki suspects foul play and takes steps to prove her theory. Jack and Clarissa follow a forensic trail connecting a dead researcher with a billionaire scientist and a secret testing programme.