Silent Witness, Season 12

This season starts with Leo arrested for drink driving and finding himself doing community service on a rough London estate where gang violence among kids is common. When Nikki investigates a murder of a young girl from the same estate, Leo finds himself in the midst of a turf war. Elsewhere Harry mentors an eager medical student who seems more interested in the media frenzy over his latest case than pathology, and Nikki investigates an armed raid on a terrorist cell, facing increasing police hostility to her investigation as she begins to suspect the victims are innocent.