Vera - Season 1 Episode 4 -

A woman is murdered in a hedgerow but her son survives the attack, only to fall beneath the ice of a frozen pond as he makes his escape. DCI Vera Stanhope wades in and drags him out, and against all the odds he pulls through. As the investigation into the mother's killing unfolds, Vera finds a kindred spirit in the boy and comes to realise the key to solving the case lies deep in his memory.