Somebody Knows is a 1932 mystery play by the British writer John Van Druten about an entertainer who is accused of strangling a prostitute.
Following a court case there is not enough evidence to convict him, leaving the audience unsure of his actual guilt.
[1] It was staged at St Martin's Theatre in the West End, running for 43 performances between 12 May and 18 June 1932.
The cast included Frank Lawton, Lawrence Hanray, Enid Stamp-Taylor and Cathleen Nesbitt.
He attributed this to the fact that audiences expected a standard whodunnit while he was interested in developing a character study.