Silent Witness ends its current run with a two-parter in which Nikki (Emilia Fox) travels to Mexico to attend the funeral of Luisa, a former intern, who died in a carjacking. In spite of the distance from the Lyell Centre, Nikki can't help looking at the case critically and uncovers irregularities in the post mortem report. Doubting the veracity of the documentation, Nikki begins to believe that the whole thing has been staged and that Luisa could be alive. Assisted by a local doctor, Nikki and Jack trace her last known movements and are led to a farm where a cartel massacre was carried out, where they start to begin to pry - and attract the kind of attention that could quickly prove deadly. Silent Witness Monday 9.00pm BBC One.