Why Didn't They Ask Evans?
Why Didn't They Ask Evans? is a mystery novel by Agatha Christie, first published in the United Kingdom by the Collins Crime Club in September 1934 and in the United States by Dodd, Mead and Company in 1935 under the title of The Boomerang Clue.
Source: Wikipedia — Why Didn't They Ask Evans? (CC BY-SA 4.0)