Wallander (UK) - Season 1 Episode 3 -

Three youngsters are shot dead whilst having a woodland picnic in fancy dress. One girl's mother reports her as missing but postcards from Paris supposedly sent by the daughter negate any police involvement. Then another parent reports that Wallander's troubled colleague, Svedberg, had earlier expressed an interest in the kids' movements, and then Svedberg is also found shot, photos of the dead trio being found in his flat along with one of a mystery woman, identified by Svedberg's cousin as his ex-girlfriend Louise. The corpses are found, and a friend of the victims ...