Silent Witness: History (Part 6)

Nikki is unsure to trust, leading her to conclude that getting the truth will put her colleagues and everything they love in danger. As they get to the heart of their investigation, and with the world they hold dear teetering on a knife edge, the Lyell team confront their threats to preserve the credibility of DNA. Conclusion of the 25th anniversary story, starring Emilia Fox, Amanda Burton and David Caves