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The Sign of Four streaming: where to watch online?

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Cast

Ian Richardson
Ian Richardson
Sherlock Holmes
David Healy
David Healy
Dr. John Watson
Thorley Walters
Thorley Walters
Major John Sholto
Michael O'Hagan
Michael O'Hagan
Mordecai Smith
Cherie Lunghi
Cherie Lunghi
Mary Morstan
Joe Melia
Joe Melia
Jonathan Small
Terence Rigby
Terence Rigby
Inspector Layton
Clive Merrison
Clive Merrison
Bartholomew Sholto
Richard Heffer
Richard Heffer
Thaddeus Sholto
John Benfield
John Benfield
McMurdo
Gordon Rollings
Gordon Rollings
Mr. Sherman
John Pedrick
John Pedrick
Tonga
Robert Russell
Robert Russell
Williams
Moti Makan
Moti Makan
Lal Rao
Kate Binchy
Kate Binchy
Maid
Merelina Kendall
Merelina Kendall
Mrs. Smith