Name – Sir Robert Muir
Species – Human
Planet – Earth
Temperament – stern
Appearances – Black Orchid

Sir Robert Muir was a friend of the Cranleigh family. He was also Chief Constable of the area, and investigated James' and Digby's murders, initially suspecting The Doctor. The Doctor gave him and Sergeant Markham a tour of the TARDIS to prove the veracity of his story.