Upstairs, Downstairs

Season 1, Episode 5: A Suitable Marriage

Select Source

December 1905: Elizabeth falls for a young German baron, whom her father is suspicious of. Richard quickly uncovers the Baron's secret, but as it turns out, Baron Klaus von Rimmer is hiding another secret, which Rose accidentally stumbles upon. The events of the evening compel one of the servants to betray not only the family, but the country as well.