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Whilst in Cornwall Holmes is approached by the local vicar to determine how Brenda Tregennis died whilst sitting in a room, playing cards with her two brothers, who were struck down with dementia as a result. The trail leads to an African adventurer and a deadly root known as the Devil's Foot.
First Air Date : May 17, 1964
Last Air date : Dec 22, 1968
Episode : 29 Episode
Season : 2 Season
Runtime: 50:14 minutes
Studio: BBC One
Country:
Cast: Peter Cushing, Nigel Stock
Crew: