Published in 1936:
The A.B.C. Murders, Murder in Mesopotamia, and Cards on the Table by Agatha Christie.
Double Indemnity by James M. Cain. Cain’s novella is the source for the screenplay for this movie that I watched last summer, starring Fred MacMurray and Barbara Stanwyck.
Jamaica Inn by Daphne duMaurier.
Gone with the Wind by Margaret Mitchell. This book was the #1 fiction bestseller of 1936, and of course, it went on to become the 1939 award-winning movie of the same title.
The Allegory of Love by C.S. Lewis.
Absalom! Absalom! by William Faulkner.
How to Win Friends and Influence People by Dale Carnegie.

Also in 1936:
Life magazine is first published.

The Carnegie Medal for excellence in children’s literature, published in the U.K., is created and awarded for the first time to Arthur Ransome for his book Pigeon Post.

Newbery Medal for children’s literature is awarded to Carol Ryrie Brink’s Caddie Woodlawn. Caddie has gotten some flack and bad press in recent years for its stereotypical and inaccurate portrayal of Native Americans. But I think this practice of reevaluating classic literature by modern PC standards is spoiler-y. Caddie Woodlawn is a good story, and the Native Americans in the book are portrayed as a child of Caddie Woodlawn’s era would probably have viewed them. ‘Nuff said.

Best-selling authors of 1936, besides Margaret Mitchell were: Sinclair Lewis, Lloyd C. Douglas, Rebecca West, Aldous Huxley, Anne Morrow Lindbergh, and Clarence Day.