Mysie Monte is best known for her long-running portrayal of Mrs Boyle in a play that opened in London's West End in which year ?
Mysie Monte: Mysie Monte (1892 - 9 January 1983) was an English stage and television actress best known for her long-running portrayal of Mrs Boyle in Agatha Christie's play The Mousetrap at the New Ambassadors Theatre. The Mousetrap:  "The Mousetrap" opened in London's West End in 1952, and has been running continuously since then.
1952