Farthingale

Lord Farthingale was the owner of the Farthingale Estate during the 1920s.

Murder
When Lord Farthingale planned a party at his house, he invited many of his close friends. However, he was unaware there was an invisible alien trapped inside his house. When he discovered the truth on the night of his party, he, and two other guests, were murdered.

His death was investigated by Dr Merrivale Carr, the Ninth Doctor and Rose Tyler. (DWA: Doctor vs Doctor)