I remember an episode where 3 children, a confident little girl, a giggling maniac, and a quiet boy. It turns out that they together killed every man talking to their mother as they didn't want them to take their mother away. Eventually they kidnap Barnaby as they think he'll be a good father..! The episode is ridiculous and I love it, do any of you remember what it was called?
Also, let's recommend the series to Pushing Up Roses, she says "The more murders in an episode the better", which is basically this series so..!