Why Didn't They Ask Evans?. Poster of the 1980 movie and cover of the 1934 book
VS3
Why Didn't They Ask Evans?
Agatha Christie, 1934
movie vs book
John Davies, Tony Wharmby, 1980

This intriguing story is set in the 1930s at a country house, where two amateur sleuths, Bobby Jones and Lady Frankie Derwent, try to unravel the mystery behind a tale of murder, suspense and false identities. And the only clues the two have to go on are the puzzling last words of a dying man.