He who whispers; The unsuspected; Crows can't count

John Dickson Carr was a very highly regarded American mystery writer, though he lived for most of the '30s and '40s in England, married there and set many of his books there (<a href=https://en.wikipedia.org/wiki/John_Dickson_Carr>Wikipedia</a>). His two main detectives, Dr. Fell and Sir Henry Merrivale, were very English (<a href=https://en.wikipedia.org/wiki/John_Dickson_Carr#Dr._Fell_and_Sir_Henry_Merrivale>Wikipedia</a>).

Charlotte Armstrong was born in Vulcan, Michigan. She attended the University of Wisconsin-Madison and received a Bachelor of Arts degree from Barnard College in 1925. Her first published novel, Lay On, MacDuff!, was published in 1942. In 1957, she received an Edgar Award from the Mystery Writers of America for her novel A Dram of Poison. Under the names Charlotte Armstrong and Jo Valentine she wrote over 28 novels, as well as working for the New York Times advertising department, as a fas...

Erle Stanley Gardner (July 17, 1889 – March 11, 1970) was a prolific American author. A former lawyer, he is best known for the Perry Mason series of legal detective stories, but he wrote numerous other novels and shorter pieces and also a series of nonfiction books, mostly narrations of his travels through Baja California and other regions in Mexico. The best-selling American author of the 20th century at the time of his death, Gardner also published under numerous pseudonyms, including A. A...