by Sir Arthur Conan Doyle.
dramatised by Giles Cooper.
[Starring] Douglas Wilmer as Sherlock Holmes, Nigel Stock as Dr. Watson
and Patrick Troughton as Mortimer Tregennis
with Carl Bernard and John Glyn-Jones
"Yes, Watson - madness and death." These are the dangers to which the great detective and his friend are exposed in solving the mystery of diabolic happenings in remote Cornwall.