Silent Witness: Discovery (Part 1 of 2)

Feature-length episode. A schoolteacher disappears and investigating officer DCI Andy Steemson asks Nikki and Jack to examine evidence found at the house, including traces of blood, bike tracks and a charred cake in the oven. Meanwhile, Thomas is called to the site of the murder of a former drug addict and petty criminal who has been thrown from the top of a flyover, and becomes determined to win justice for the victim in the wake of police indifference - forming an unlikely alliance in the process