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This series always builds to a brilliant finale, and tonight and tomorrow’s two-parter is no exception.

Nikki is in Mexico to investigate the disappearance of her intern, Luisa, and discovers she was taken by the cartel, a brutal bunch kidnapping and torturing locals.

Luisa was trying to help grieving families find the bodies of their loved ones. Jack flies out to help his colleague and bring her home, but, in typical Nikki style, she can’t walk away.

As they try to help the locals, Nikki and Jack put themselves in the middle of a vicious battle in a lawless land. Distressing and shocking, but Silent Witness fans would expect nothing less.