Quote of the day by Agatha Christie: "It's what's in yourself that makes you happy or unhappy"

Agatha Christie was a famous mystery writer from Britain. She created popular detective characters like Hercule Poirot and Miss Marple. Her crime novels and plays became bestsellers and many were turned into movies and TV shows. Christie also traveled with her archaeologist husband and wrote about those experiences. She later received a major British honor for her contribution to literature.