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Mandatory Credit: Photo by ANL/REX (1387766a) Actress Dame Sybil Thorndike Seen A A Party To Celebrate The 10 Year Run Of Agatha Christie's Play 'the Mousetrap'. Dame Sybil Thorndike (24 October 1882-9 June 1976). Actress Dame Sybil Thorndike Seen A A Party To Celebrate The 10 Year Run Of Agatha Christie's Play 'the Mousetrap'. Dame Sybil Thorndike (24 October 1882-9 June 1976).