Have you read Amazon's best-selling book of 2015?

Story highlights

  • "The Girl on the Train" is the No. 1 best-seller of the year on Amazon
  • Two nonfiction works -- and two coloring books -- made the top 20
  • Many familiar authors are also on the list

(CNN)Harper Lee's "Go Set a Watchman" may have been Goodreads' best fiction book of 2015.

Ta-Nehisi Coates' "Between the World and Me" may have dominated honors given to the year's literary output.