Final Four is a sports term that is commonly applied to the last four teams remaining in a playoff tournament. The term usually refers to the four teams who compete in the two games of a single-elimination tournament's semi-final (penultimate) round. Of these teams, the two who win in the semi-final round play another single-elimination game whose winner is the tournament champion. In some tournaments, the two teams that lose in the semi-final round compete for third place in a consolation game a tournament format where four teams play two rounds of single-elimination games, resulting in a single champion.

The term "final four" is most often used in the United States and in sports heavily influenced by that country; elsewhere, only the term "semi-finals" is in common use. "Final four" first appeared in print in a 1975 article for the Official Collegiate Basketball Guide, whose author Ed Chay was a sportswriter for the Cleveland Plain Dealer. Chaye stated that the Marquette basketball squadron "was one of the final four" during the previous season's tournament. The NCAA began to use the term and later trademarked it.

Dame Agatha Mary Clarissa Christie DBE (née Miller; 15 September 1890 – 12 January 1976) was a British crime writer of novels, short stories, and plays. She also wrote romances under the name Mary Westmacott, but she is best remembered for her 66 detective novels and more than 15 short story collections (especially those featuring Hercule Poirot or Miss Jane Marple), and her successful West End plays.

According to the Guinness Book of World Records, Christie is the best-selling novelist of all time. Her novels have sold roughly four billion copies, and her estate claims that her works rank third, after those of William Shakespeare and the Bible, as the most widely published books. According to Index Translationum, Christie is the most translated individual author, with only the collective corporate works of Walt Disney Productions surpassing her. Her books have been translated into at least 103 languages.

Agatha Christie published two autobiographies: a posthumous one covering childhood to old age; and another chronicling several seasons of archaeological excavation in Syria and Iraq with her second husband, archaeologist Max Mallowan. The latter was published in 1946 with the title, Come, Tell Me How You Live.