Steven, the name of the character played by actress Norah Baring in 
Hitchcock's MURDER! is, as you say, Diana Baring in the film - but was 
Martella Baring in the novel.  (The film is based on the novel.  There 
is no stage play.  The novel was co-authored by 'Clemence Dane'  - real 
name Winifred Ashton - and Helen Simpson.)

- Ken Mogg

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