Silent Witness

When Leo's friend commits suicide, Harry and Nikki are called to the scene of a violent and calculated murder, which is thought to be the work of an apparently dormant serial killer.

Harry and DI James deviate from the original investigation to secretly test DNA evidence from the rival Chesham laboratory to try to solve this stalled case.

Harry's work colleague Justine Thompson is murdered in her house with her daughter Gemma whilst her stepson Charlie, also attacked, lies in a coma. Baby daughter Ellie, however, is unharmed. Husband Stuart is prime suspect but he has an alibi and his grief seems genuine. The post mortem shows that Gemma was pregnant and the team learns that Justine once needed order against Stuart's brother Kevin.

After Kevin dies in a motorcycle crash Harry is surprised to see Joel keeping a vigil by Charlie's hospital bed. Whilst denying murder Joel professes that he loved Gemma was shocked that she was sleeping with Charlie. Stuart's initial alibi breaks down when CCTV footage shows Kevin, not him, at the hotel in question but he admits to an affair with Mrs Barron.

Nikki is approached to help identify the paltry remains of a serial killer's undiscovered victims.

Nikki is forced to confront manipulative serial killer Arnold Mears face to face in order to save Annie.

Leo battles with the authorities at the notorious Redhill prison to seek justice for the murder of an ex-prison inspector.

While Harry and Nicky investigate DI Bridges, Leo puts himself in danger when he follows his instinct and trails violent prison officer Kessler.

Leo is determined to uncover the truth surrounding the death of a young girl who was being treated by his college friend.

Nikki and Harry track down the catholic nun behind the exorcism only to find that John now believes he's possessed, but can he be saved?

Nikki stumbles across a sinister underworld where teenage girls are groomed for sex and forced into prostitution.

Harry and Nikki make a crucial connection between the dead girls and sex-grooming victim Shannon, but is it too late for Hannah and Lauren?