Vera - Season 2 Episode 2 Silent Voices

Vera investigates the case of a murdered social worked named Jenny Lister, who was universally considered to have been principled and popular. However, in an overworked and understaffed social work system, a notorious case involving the death of a child seems to hold the key to solving the killing. As Vera pursues the truth, she discovers the real secret at the heart of Jenny's death - and the killer who will stop at nothing to keep it hidden